A flaw has been found in fatbobman mail-mcp-bridge up to 1.3.3. Affected is an unknown function of the file src/mail_mcp_server.py. Executing a manipulation of the argument message_ids can lead to path traversal. The attack can be executed remotely. The exploit has been published and may be used. Upgrading to version 1.3.4 is able to address this issue. This patch is called 638b162b26532e32fa8d8047f638537dbdfe197a. Upgrading the affected component is recommended.
Casky was already ahead
This CVE exploits attack patterns that Casky's 331matched 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.
CVE-2026-7386 is a remote path traversal vulnerability in fatbobman's mail-mcp-bridge versions up to 1.3.3, stemming from insufficient input validation on the message_ids parameter in src/mail_mcp_server.py. This CWE-22 weakness allows attackers to manipulate file paths and access arbitrary files on affected systems without authentication, posing a significant risk to organizations using this mail integration component. The vulnerability is particularly concerning because it enables remote exploitation and has documented proof-of-concept code in the wild, making it attractive to threat actors seeking unauthorized data access or system reconnaissance.
Casky's 331 mapped security skills leverage Claude's extended reasoning to detect the attack patterns underlying this vulnerability by analyzing MITRE ATT&CK techniques TA0001 (Initial Access) and TA0007 (Discovery). Practitioners using Casky would observe detection patterns identifying suspicious message_ids parameter manipulation attempts—such as encoded traversal sequences (../, ..\, or Unicode variants)—combined with anomalous file system access patterns that deviate from normal mail server operations. The platform's skill-driven analysis would flag attempts to access files outside intended mail directories, correlate these with initial access vectors, and highlight discovery activities characteristic of post-exploitation reconnaissance, enabling security teams to distinguish legitimate mail processing from exploitation attempts before compromise occurs.
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-2026-7386.
Casky has 331 skills that investigate the attack patterns behind CVE-2026-7386. Run one and get CVSS-scored findings in 3 minutes.
Run the skill that detects this →analyzing-office365-audit-logs-for-compromise
cloud security · low
analyzing-persistence-mechanisms-in-linux
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analyzing-powershell-empire-artifacts
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detecting-misconfigured-azure-storage
cloud security · low
detecting-mobile-malware-behavior
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ot ics security · medium
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detecting-oauth-token-theft
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detecting-pass-the-hash-attacks
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detecting-process-hollowing-technique
threat hunting · low
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detecting-serverless-function-injection
cloud security · low
detecting-service-account-abuse
threat hunting · low
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ot ics security · medium
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detecting-suspicious-powershell-execution
threat hunting · low
detecting-t1003-credential-dumping-with-edr
threat hunting · low
detecting-t1055-process-injection-with-sysmon
threat hunting · low
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threat hunting · low
detecting-wmi-persistence
threat hunting · low
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red teaming · high
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api security · medium
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web application security · medium
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api security · medium
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red teaming · high
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hunting-for-spearphishing-indicators
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threat hunting · low
hunting-for-supply-chain-compromise
threat hunting · low
hunting-for-suspicious-scheduled-tasks
threat hunting · low
hunting-for-t1098-account-manipulation
threat hunting · low
hunting-for-unusual-network-connections
threat hunting · low
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threat hunting · low
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phishing defense · medium
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api security · medium
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devsecops · low
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vulnerability management · medium
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cloud security · low
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cloud security · low
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cloud security · low
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vulnerability management · medium
implementing-cloud-waf-rules
cloud security · low
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devsecops · low
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ot ics security · medium
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ot ics security · medium
implementing-email-sandboxing-with-proofpoint
phishing defense · medium
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devsecops · low
implementing-gcp-binary-authorization
cloud security · low
implementing-gcp-organization-policy-constraints
cloud security · low
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cloud security · low
implementing-github-advanced-security-for-code-scanning
devsecops · low
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phishing defense · medium
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ot ics security · medium
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ot ics security · medium
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devsecops · low
implementing-mimecast-targeted-attack-protection
phishing defense · medium
implementing-mobile-application-management
mobile security · low
implementing-nerc-cip-compliance-controls
ot ics security · medium
implementing-network-segmentation-for-ot
ot ics security · medium
implementing-ot-incident-response-playbook
ot ics security · medium
implementing-ot-network-traffic-analysis-with-nozomi
ot ics security · medium
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ot ics security · medium
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devsecops · low
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ot ics security · medium
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vulnerability management · medium
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devsecops · low
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cloud security · low
implementing-secrets-scanning-in-ci-cd
devsecops · low
implementing-semgrep-for-custom-sast-rules
devsecops · low
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devsecops · low
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devsecops · low
intercepting-mobile-traffic-with-burpsuite
mobile security · low
managing-cloud-identity-with-okta
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performing-active-directory-bloodhound-analysis
red teaming · high
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phishing defense · medium
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devsecops · low
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red teaming · high
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phishing defense · medium
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api security · medium
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api security · medium
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web application security · medium
performing-http-parameter-pollution-attack
web application security · medium
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ot ics security · medium
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red teaming · high
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performing-iot-security-assessment
penetration testing · medium
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performing-kerberoasting-attack
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ot ics security · medium
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penetration testing · medium
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performing-web-application-scanning-with-nikto
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remediating-s3-bucket-misconfiguration
cloud security · low
reverse-engineering-ios-app-with-frida
mobile security · low
scanning-containers-with-trivy-in-cicd
devsecops · low
scanning-infrastructure-with-nessus
vulnerability management · medium
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-github-actions-workflows
devsecops · low
securing-historian-server-in-ot-environment
ot ics security · medium
securing-kubernetes-on-cloud
cloud security · low
securing-remote-access-to-ot-environment
ot ics security · medium
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
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web application security · medium
testing-for-email-header-injection
web application security · medium
testing-for-host-header-injection
web application security · medium
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web application security · medium
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web application security · medium
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web application security · medium
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web application security · medium
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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
triaging-vulnerabilities-with-ssvc-framework
vulnerability management · medium
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