The Blocksy theme for WordPress is vulnerable to PHP Object Injection leading to Remote Code Execution via the 'blocksy_meta' REST API field and the V200 database migration in versions up to and including 2.1.35. This is due to insufficient input sanitization in the blocksy_sanitize_post_meta_options() function, which only blocks values containing '<' or '>' and does not prevent serialized PHP object strings from being stored in post meta, combined with the SearchReplacer::run_recursively() function unconditionally deserializing all string values via @unserialize() during migration without restricting allowed classes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject a serialized Blocksy\RaiiPattern object into post meta that, when the V200 migration runs on an upgraded site, is deserialized and triggers RaiiPattern::__destruct(), which executes arbitrary PHP callables via call_user_func().
Casky was already ahead
This CVE exploits attack patterns that Casky's 419matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.
The Blocksy WordPress theme contains a critical PHP Object Injection vulnerability affecting versions up to 2.1.35 that allows unauthenticated attackers to achieve Remote Code Execution. The flaw exists in the blocksy_sanitize_post_meta_options() function within the REST API's 'blocksy_meta' field, where insufficient input validation fails to prevent serialized PHP objects from being stored in post metadata. When combined with the SearchReplacer::run_recursively() function during database migrations, attackers can inject malicious serialized objects that execute arbitrary PHP code on the server. This vulnerability is particularly dangerous because it affects a widely-used WordPress theme and requires minimal attack complexity, putting thousands of WordPress sites at immediate risk of complete server compromise.
Casky's 419 mapped skills detect this attack chain by correlating three critical MITRE ATT&CK techniques: Initial Access (TA0001) through REST API exploitation, Execution (TA0002) via PHP code execution during object deserialization, and Discovery (TA0043) activities as attackers probe the blocksy_meta endpoint. Security practitioners using Casky's extended reasoning capabilities would identify suspicious patterns including: unusual serialized object strings in REST API requests targeting /wp-json/blocksy/ endpoints, post_meta database entries containing 'O:' serialization markers, abnormal PHP function calls originating from the theme's sanitization functions, and timing anomalies around database migration processes. The platform would flag instances where input sanitization bypasses (exploiting the '<' and '>' character restriction) allow base64-encoded or escaped serialized payloads to pass validation, combined with execution artifacts from magic method invocations (__wakeup, __destruct) that indicate object instantiation.
Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →
These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-8365.
Casky has 419 skills that investigate the attack patterns behind CVE-2026-8365. Run one and get CVSS-scored findings in 3 minutes.
Run the skill that detects this →analyzing-campaign-attribution-evidence
threat intelligence · low
analyzing-certificate-transparency-for-phishing
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container security · low
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threat intelligence · low
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threat intelligence · low
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cloud security · low
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cloud security · low
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auditing-tls-certificate-transparency-logs
threat intelligence · low
automating-ioc-enrichment
threat intelligence · low
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soc operations · low
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red teaming · high
building-cloud-siem-with-sentinel
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soc operations · low
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devsecops · low
building-incident-response-dashboard
soc operations · low
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threat intelligence · low
building-patch-tuesday-response-process
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building-soc-escalation-matrix
soc operations · low
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soc operations · low
building-soc-playbook-for-ransomware
soc operations · low
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threat intelligence · low
building-threat-intelligence-enrichment-in-splunk
soc operations · low
building-threat-intelligence-feed-integration
soc operations · low
building-threat-intelligence-platform
threat intelligence · low
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vulnerability management · medium
building-vulnerability-scanning-workflow
soc operations · low
bypassing-authentication-with-forced-browsing
web application security · medium
collecting-open-source-intelligence
threat intelligence · low
collecting-threat-intelligence-with-misp
threat intelligence · low
conducting-api-security-testing
penetration testing · medium
conducting-cloud-penetration-testing
cloud security · low
conducting-domain-persistence-with-dcsync
red teaming · high
conducting-external-reconnaissance-with-osint
penetration testing · medium
conducting-full-scope-red-team-engagement
red teaming · high
conducting-internal-network-penetration-test
penetration testing · medium
conducting-internal-reconnaissance-with-bloodhound-ce
red teaming · high
conducting-mobile-app-penetration-test
penetration testing · medium
conducting-network-penetration-test
penetration testing · medium
conducting-pass-the-ticket-attack
red teaming · high
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penetration testing · medium
conducting-social-engineering-pretext-call
red teaming · high
conducting-spearphishing-simulation-campaign
red teaming · high
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configuring-host-based-intrusion-detection
endpoint security · low
configuring-windows-defender-advanced-settings
endpoint security · low
configuring-windows-event-logging-for-detection
endpoint security · low
correlating-security-events-in-qradar
soc operations · low
correlating-threat-campaigns
threat intelligence · low
deobfuscating-javascript-malware
malware analysis · medium
deobfuscating-powershell-obfuscated-malware
malware analysis · medium
deploying-edr-agent-with-crowdstrike
endpoint security · low
deploying-osquery-for-endpoint-monitoring
endpoint security · low
detecting-api-enumeration-attacks
api security · medium
detecting-aws-cloudtrail-anomalies
cloud security · low
detecting-aws-credential-exposure-with-trufflehog
cloud security · low
detecting-aws-guardduty-findings-automation
cloud security · low
detecting-aws-iam-privilege-escalation
cloud security · low
detecting-azure-lateral-movement
cloud security · low
detecting-azure-service-principal-abuse
cloud security · low
detecting-azure-storage-account-misconfigurations
cloud security · low
detecting-broken-object-property-level-authorization
api security · medium
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phishing defense · medium
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cloud security · low
detecting-compromised-cloud-credentials
cloud security · low
detecting-container-drift-at-runtime
container security · low
detecting-container-escape-attempts
container security · low
detecting-container-escape-with-falco-rules
container security · low
detecting-cryptomining-in-cloud
cloud security · low
detecting-evasion-techniques-in-endpoint-logs
endpoint security · low
detecting-fileless-attacks-on-endpoints
endpoint security · low
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malware analysis · medium
detecting-misconfigured-azure-storage
cloud security · low
detecting-mobile-malware-behavior
mobile security · low
detecting-oauth-token-theft
cloud security · low
detecting-privilege-escalation-in-kubernetes-pods
container security · low
detecting-process-injection-techniques
malware analysis · medium
detecting-qr-code-phishing-with-email-security
phishing defense · medium
detecting-rootkit-activity
malware analysis · medium
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detecting-serverless-function-injection
cloud security · low
detecting-shadow-api-endpoints
api security · medium
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cloud security · low
detecting-spearphishing-with-email-gateway
phishing defense · medium
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cloud security · low
evaluating-threat-intelligence-platforms
threat intelligence · low
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penetration testing · medium
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red teaming · high
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red teaming · high
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red teaming · high
exploiting-api-injection-vulnerabilities
api security · medium
exploiting-broken-function-level-authorization
api security · medium
exploiting-broken-link-hijacking
web application security · medium
exploiting-constrained-delegation-abuse
red teaming · high
exploiting-deeplink-vulnerabilities
mobile security · low
exploiting-excessive-data-exposure-in-api
api security · medium
exploiting-http-request-smuggling
web application security · medium
exploiting-idor-vulnerabilities
web application security · medium
exploiting-insecure-data-storage-in-mobile
mobile security · low
exploiting-insecure-deserialization
web application security · medium
exploiting-jwt-algorithm-confusion-attack
api security · medium
exploiting-kerberoasting-with-impacket
red teaming · high
exploiting-mass-assignment-in-rest-apis
web application security · medium
exploiting-ms17-010-eternalblue-vulnerability
red teaming · high
exploiting-nopac-cve-2021-42278-42287
red teaming · high
exploiting-nosql-injection-vulnerabilities
web application security · medium
exploiting-oauth-misconfiguration
web application security · medium
exploiting-prototype-pollution-in-javascript
web application security · medium
exploiting-race-condition-vulnerabilities
web application security · medium
exploiting-server-side-request-forgery
web application security · medium
exploiting-sql-injection-vulnerabilities
penetration testing · medium
exploiting-sql-injection-with-sqlmap
web application security · medium
exploiting-template-injection-vulnerabilities
web application security · medium
exploiting-type-juggling-vulnerabilities
web application security · medium
exploiting-vulnerabilities-with-metasploit-framework
vulnerability management · medium
exploiting-websocket-vulnerabilities
web application security · medium
exploiting-zerologon-vulnerability-cve-2020-1472
red teaming · high
extracting-config-from-agent-tesla-rat
malware analysis · medium
extracting-iocs-from-malware-samples
malware analysis · medium
generating-threat-intelligence-reports
threat intelligence · low
hardening-docker-containers-for-production
container security · low
hardening-docker-daemon-configuration
container security · low
hardening-linux-endpoint-with-cis-benchmark
endpoint security · low
hardening-windows-endpoint-with-cis-benchmark
endpoint security · low
hunting-advanced-persistent-threats
threat intelligence · low
implementing-alert-fatigue-reduction
soc operations · low
implementing-anti-phishing-training-program
phishing defense · medium
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api security · medium
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api security · medium
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api security · medium
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api security · medium
implementing-api-schema-validation-security
api security · medium
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api security · medium
implementing-api-security-testing-with-42crunch
api security · medium
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api security · medium
implementing-application-whitelisting-with-applocker
endpoint security · low
implementing-aqua-security-for-container-scanning
devsecops · low
implementing-attack-path-analysis-with-xm-cyber
vulnerability management · medium
implementing-aws-config-rules-for-compliance
cloud security · low
implementing-aws-macie-for-data-classification
cloud security · low
implementing-aws-nitro-enclave-security
cloud security · low
implementing-aws-security-hub
cloud security · low
implementing-aws-security-hub-compliance
cloud security · low
implementing-azure-defender-for-cloud
cloud security · low
implementing-cloud-dlp-for-data-protection
cloud security · low
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cloud security · low
implementing-cloud-vulnerability-posture-management
vulnerability management · medium
implementing-cloud-waf-rules
cloud security · low
implementing-cloud-workload-protection
cloud security · low
implementing-code-signing-for-artifacts
devsecops · low
implementing-container-image-minimal-base-with-distroless
container security · low
implementing-container-network-policies-with-calico
container security · low
implementing-continuous-security-validation-with-bas
vulnerability management · medium
implementing-diamond-model-analysis
threat intelligence · low
implementing-disk-encryption-with-bitlocker
endpoint security · low
implementing-dmarc-dkim-spf-email-security
phishing defense · medium
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phishing defense · medium
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endpoint security · low
implementing-epss-score-for-vulnerability-prioritization
vulnerability management · medium
implementing-file-integrity-monitoring-with-aide
endpoint security · low
implementing-fuzz-testing-in-cicd-with-aflplusplus
devsecops · low
implementing-gcp-binary-authorization
cloud security · low
implementing-gcp-organization-policy-constraints
cloud security · low
implementing-gcp-vpc-firewall-rules
cloud security · low
implementing-gdpr-data-protection-controls
compliance governance · low
implementing-github-advanced-security-for-code-scanning
devsecops · low
implementing-google-workspace-phishing-protection
phishing defense · medium
implementing-image-provenance-verification-with-cosign
container security · low
implementing-infrastructure-as-code-security-scanning
devsecops · low
implementing-iso-27001-information-security-management
compliance governance · low
implementing-kubernetes-network-policy-with-calico
container security · low
implementing-kubernetes-pod-security-standards
container security · low
implementing-memory-protection-with-dep-aslr
endpoint security · low
implementing-mimecast-targeted-attack-protection
phishing defense · medium
implementing-mitre-attack-coverage-mapping
soc operations · low
implementing-mobile-application-management
mobile security · low
implementing-network-policies-for-kubernetes
container security · low
implementing-opa-gatekeeper-for-policy-enforcement
container security · low
implementing-patch-management-workflow
vulnerability management · medium
implementing-pci-dss-compliance-controls
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implementing-pod-security-admission-controller
container security · low
implementing-policy-as-code-with-open-policy-agent
devsecops · low
implementing-proofpoint-email-security-gateway
phishing defense · medium
implementing-rapid7-insightvm-for-scanning
vulnerability management · medium
implementing-rbac-hardening-for-kubernetes
container security · low
implementing-runtime-security-with-tetragon
container security · low
implementing-secret-scanning-with-gitleaks
devsecops · low
implementing-secrets-management-with-vault
cloud security · low
implementing-secrets-scanning-in-ci-cd
devsecops · low
implementing-security-information-sharing-with-stix2
threat intelligence · low
implementing-semgrep-for-custom-sast-rules
devsecops · low
implementing-siem-use-cases-for-detection
soc operations · low
implementing-soar-automation-with-phantom
soc operations · low
implementing-soar-playbook-with-palo-alto-xsoar
soc operations · low
implementing-stix-taxii-feed-integration
threat intelligence · low
implementing-supply-chain-security-with-in-toto
container security · low
implementing-taxii-server-with-opentaxii
threat intelligence · low
implementing-threat-intelligence-lifecycle-management
threat intelligence · low
implementing-threat-modeling-with-mitre-attack
soc operations · low
implementing-ticketing-system-for-incidents
soc operations · low
implementing-usb-device-control-policy
endpoint security · low
implementing-vulnerability-management-with-greenbone
vulnerability management · medium
implementing-vulnerability-remediation-sla
vulnerability management · medium
implementing-vulnerability-sla-breach-alerting
vulnerability management · medium
implementing-web-application-logging-with-modsecurity
web application security · medium
implementing-zero-trust-in-cloud
cloud security · low
implementing-zero-trust-network-access
cloud security · low
integrating-dast-with-owasp-zap-in-pipeline
devsecops · low
integrating-sast-into-github-actions-pipeline
devsecops · low
intercepting-mobile-traffic-with-burpsuite
mobile security · low
investigating-insider-threat-indicators
soc operations · low
investigating-phishing-email-incident
soc operations · low
managing-cloud-identity-with-okta
cloud security · low
managing-intelligence-lifecycle
threat intelligence · low
mapping-mitre-attack-techniques
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monitoring-darkweb-sources
threat intelligence · low
performing-active-directory-bloodhound-analysis
red teaming · high
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performing-ai-driven-osint-correlation
threat intelligence · low
performing-alert-triage-with-elastic-siem
soc operations · low
performing-android-app-static-analysis-with-mobsf
mobile security · low
performing-api-fuzzing-with-restler
api security · medium
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api security · medium
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api security · medium
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performing-aws-account-enumeration-with-scout-suite
cloud security · low
performing-aws-privilege-escalation-assessment
cloud security · low
performing-blind-ssrf-exploitation
web application security · medium
performing-brand-monitoring-for-impersonation
threat intelligence · low
performing-clickjacking-attack-test
web application security · medium
performing-cloud-asset-inventory-with-cartography
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performing-cloud-forensics-with-aws-cloudtrail
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performing-cloud-log-forensics-with-athena
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performing-cloud-native-forensics-with-falco
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performing-cloud-native-threat-hunting-with-aws-detective
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performing-cloud-penetration-testing-with-pacu
cloud security · low
performing-container-escape-detection
container security · low
performing-container-image-hardening
devsecops · low
performing-container-security-scanning-with-trivy
container security · low
performing-content-security-policy-bypass
web application security · medium
performing-credential-access-with-lazagne
red teaming · high
performing-csrf-attack-simulation
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performing-cve-prioritization-with-kev-catalog
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performing-dark-web-monitoring-for-threats
threat intelligence · low
performing-deception-technology-deployment
soc operations · low
performing-directory-traversal-testing
web application security · medium
performing-dmarc-policy-enforcement-rollout
phishing defense · medium
performing-docker-bench-security-assessment
container security · low
performing-dynamic-analysis-of-android-app
mobile security · low
performing-dynamic-analysis-with-any-run
malware analysis · medium
performing-endpoint-forensics-investigation
endpoint security · low
performing-endpoint-vulnerability-remediation
endpoint security · low
performing-external-network-penetration-test
penetration testing · medium
performing-false-positive-reduction-in-siem
soc operations · low
performing-firmware-malware-analysis
malware analysis · medium
performing-gcp-penetration-testing-with-gcpbucketbrute
cloud security · low
performing-gcp-security-assessment-with-forseti
cloud security · low
performing-graphql-depth-limit-attack
api security · medium
performing-graphql-introspection-attack
api security · medium
performing-graphql-security-assessment
web application security · medium
performing-http-parameter-pollution-attack
web application security · medium
performing-indicator-lifecycle-management
threat intelligence · low
performing-initial-access-with-evilginx3
red teaming · high
performing-ioc-enrichment-automation
soc operations · low
performing-ios-app-security-assessment
mobile security · low
performing-iot-security-assessment
penetration testing · medium
performing-ip-reputation-analysis-with-shodan
threat intelligence · low
performing-jwt-none-algorithm-attack
api security · medium
performing-kerberoasting-attack
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container security · low
performing-kubernetes-etcd-security-assessment
container security · low
performing-kubernetes-penetration-testing
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soc operations · low
performing-lateral-movement-with-wmiexec
red teaming · high
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performing-malware-ioc-extraction
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performing-memory-forensics-with-volatility3-plugins
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performing-nist-csf-maturity-assessment
compliance governance · low
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red teaming · high
performing-osint-with-spiderfoot
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soc operations · low
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devsecops · low
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performing-security-headers-audit
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api security · medium
performing-soc-tabletop-exercise
soc operations · low
performing-static-malware-analysis-with-pe-studio
malware analysis · medium
performing-subdomain-enumeration-with-subfinder
web application security · medium
performing-thick-client-application-penetration-test
penetration testing · medium
performing-threat-emulation-with-atomic-red-team
threat intelligence · low
performing-threat-hunting-with-elastic-siem
soc operations · low
performing-threat-intelligence-sharing-with-misp
threat intelligence · low
performing-threat-landscape-assessment-for-sector
threat intelligence · low
performing-threat-modeling-with-owasp-threat-dragon
devsecops · low
performing-user-behavior-analytics
soc operations · low
performing-vulnerability-scanning-with-nessus
penetration testing · medium
performing-web-application-firewall-bypass
web application security · medium
performing-web-application-penetration-test
penetration testing · medium
performing-web-application-scanning-with-nikto
vulnerability management · medium
performing-web-application-vulnerability-triage
vulnerability management · medium
performing-web-cache-deception-attack
web application security · medium
performing-web-cache-poisoning-attack
web application security · medium
performing-wireless-network-penetration-test
penetration testing · medium
performing-yara-rule-development-for-detection
malware analysis · medium
prioritizing-vulnerabilities-with-cvss-scoring
vulnerability management · medium
processing-stix-taxii-feeds
threat intelligence · low
profiling-threat-actor-groups
threat intelligence · low
remediating-s3-bucket-misconfiguration
cloud security · low
reverse-engineering-android-malware-with-jadx
malware analysis · medium
reverse-engineering-dotnet-malware-with-dnspy
malware analysis · medium
reverse-engineering-ios-app-with-frida
mobile security · low
reverse-engineering-malware-with-ghidra
malware analysis · medium
reverse-engineering-ransomware-encryption-routine
malware analysis · medium
reverse-engineering-rust-malware
malware analysis · medium
scanning-container-images-with-grype
container security · low
scanning-containers-with-trivy-in-cicd
devsecops · low
scanning-docker-images-with-trivy
container security · low
scanning-infrastructure-with-nessus
vulnerability management · medium
scanning-kubernetes-manifests-with-kubesec
container security · low
securing-api-gateway-with-aws-waf
cloud security · low
securing-aws-iam-permissions
cloud security · low
securing-aws-lambda-execution-roles
cloud security · low
securing-azure-with-microsoft-defender
cloud security · low
securing-container-registry-images
cloud security · low
securing-container-registry-with-harbor
container security · low
securing-github-actions-workflows
devsecops · low
securing-helm-chart-deployments
container security · low
securing-kubernetes-on-cloud
cloud security · low
securing-serverless-functions
cloud security · low
testing-android-intents-for-vulnerabilities
mobile security · low
testing-api-authentication-weaknesses
api security · medium
testing-api-for-broken-object-level-authorization
api security · medium
testing-api-for-mass-assignment-vulnerability
api security · medium
testing-api-security-with-owasp-top-10
web application security · medium
testing-cors-misconfiguration
web application security · medium
testing-for-broken-access-control
web application security · medium
testing-for-business-logic-vulnerabilities
web application security · medium
testing-for-email-header-injection
web application security · medium
testing-for-host-header-injection
web application security · medium
testing-for-json-web-token-vulnerabilities
web application security · medium
testing-for-open-redirect-vulnerabilities
web application security · medium
testing-for-sensitive-data-exposure
web application security · medium
testing-for-xml-injection-vulnerabilities
web application security · medium
testing-for-xss-vulnerabilities
penetration testing · medium
testing-for-xss-vulnerabilities-with-burpsuite
web application security · medium
testing-for-xxe-injection-vulnerabilities
web application security · medium
testing-jwt-token-security
web application security · medium
testing-mobile-api-authentication
mobile security · low
testing-oauth2-implementation-flaws
api security · medium
testing-websocket-api-security
api security · medium
tracking-threat-actor-infrastructure
threat intelligence · low
triaging-security-alerts-in-splunk
soc operations · low
triaging-vulnerabilities-with-ssvc-framework
vulnerability management · medium
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