Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to sanitize sensitive configuration fields before including them in support packet generation, which allows a Mattermost System Admin or any party with access to a support packet to obtain sensitive credentials in plaintext via downloading a support packet from the System Console.. Mattermost Advisory ID: MMSA-2026-00607
Casky was already ahead
This CVE exploits attack patterns that Casky's 261matched 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.
Mattermost versions 11.5.x through 11.5.1, 10.11.x through 10.11.13, and 11.4.x through 11.4.3 contain a critical information disclosure vulnerability in their support packet generation process. The vulnerability stems from insufficient sanitization of sensitive configuration fields before they are bundled into support packets, allowing System Administrators or anyone with access to downloaded support packets to extract plaintext credentials and other sensitive data. This affects organizations relying on Mattermost for team communication and collaboration, as the support packet feature—typically intended for diagnostic purposes—becomes a vector for credential exposure. The threat is particularly acute because System Admins legitimately access these packets for troubleshooting, and the compromised credentials could grant attackers direct access to critical systems and services configured within Mattermost.
Casky's skill mapping to MITRE ATT&CK techniques TA0043 (Reconnaissance) and TA0009 (Collection) enables detection of this vulnerability's exploitation patterns across your security posture. The 261 matching skills leverage Claude's extended reasoning to identify telemetry associated with suspicious support packet downloads from the System Console, anomalous administrative access patterns, and lateral movement attempts using credentials extracted from support packets. Practitioners would observe findings highlighting unauthorized or unusual support packet generation requests, potential exfiltration of configuration data, and correlation with subsequent credential usage across infrastructure—all mapped to Collection techniques that adversaries employ to gather sensitive information post-compromise. By cross-referencing these attack patterns with your Mattermost deployment inventory and administrative activity logs, Casky helps teams rapidly distinguish legitimate diagnostics from potential exploitation attempts.
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These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-6346.
Casky has 261 skills that investigate the attack patterns behind CVE-2026-6346. 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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analyzing-cyber-kill-chain
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analyzing-docker-container-forensics
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analyzing-email-headers-for-phishing-investigation
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analyzing-indicators-of-compromise
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analyzing-linux-kernel-rootkits
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analyzing-linux-system-artifacts
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analyzing-lnk-file-and-jump-list-artifacts
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analyzing-malware-family-relationships-with-malpedia
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analyzing-persistence-mechanisms-in-linux
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analyzing-powershell-empire-artifacts
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analyzing-prefetch-files-for-execution-history
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analyzing-windows-amcache-artifacts
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analyzing-windows-lnk-files-for-artifacts
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analyzing-windows-prefetch-with-python
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analyzing-windows-registry-for-artifacts
digital forensics · low
analyzing-windows-shellbag-artifacts
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auditing-tls-certificate-transparency-logs
threat intelligence · low
automating-ioc-enrichment
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building-adversary-infrastructure-tracking-system
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building-attack-pattern-library-from-cti-reports
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building-c2-infrastructure-with-sliver-framework
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building-ioc-enrichment-pipeline-with-opencti
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bypassing-authentication-with-forced-browsing
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collecting-threat-intelligence-with-misp
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correlating-threat-campaigns
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detecting-anomalies-in-industrial-control-systems
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detecting-dll-sideloading-attacks
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detecting-dnp3-protocol-anomalies
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detecting-email-forwarding-rules-attack
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detecting-golden-ticket-attacks-in-kerberos-logs
threat hunting · low
detecting-insider-threat-behaviors
threat hunting · low
detecting-kerberoasting-attacks
threat hunting · low
detecting-lateral-movement-with-splunk
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detecting-malicious-scheduled-tasks-with-sysmon
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detecting-privilege-escalation-attempts
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detecting-process-hollowing-technique
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detecting-service-account-abuse
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detecting-stuxnet-style-attacks
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detecting-suspicious-powershell-execution
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detecting-t1003-credential-dumping-with-edr
threat hunting · low
detecting-t1055-process-injection-with-sysmon
threat hunting · low
detecting-t1548-abuse-elevation-control-mechanism
threat hunting · low
detecting-wmi-persistence
threat hunting · low
evaluating-threat-intelligence-platforms
threat intelligence · low
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exploiting-active-directory-certificate-services-esc1
red teaming · high
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red teaming · high
exploiting-broken-link-hijacking
web application security · medium
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red teaming · high
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red teaming · high
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exploiting-nopac-cve-2021-42278-42287
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exploiting-prototype-pollution-in-javascript
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exploiting-websocket-vulnerabilities
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exploiting-zerologon-vulnerability-cve-2020-1472
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digital forensics · low
extracting-credentials-from-memory-dump
digital forensics · low
extracting-windows-event-logs-artifacts
digital forensics · low
generating-threat-intelligence-reports
threat intelligence · low
hunting-advanced-persistent-threats
threat intelligence · low
hunting-for-anomalous-powershell-execution
threat hunting · low
hunting-for-beaconing-with-frequency-analysis
threat hunting · low
hunting-for-cobalt-strike-beacons
threat hunting · low
hunting-for-command-and-control-beaconing
threat hunting · low
hunting-for-data-exfiltration-indicators
threat hunting · low
hunting-for-data-staging-before-exfiltration
threat hunting · low
hunting-for-dcom-lateral-movement
threat hunting · low
hunting-for-dcsync-attacks
threat hunting · low
hunting-for-defense-evasion-via-timestomping
threat hunting · low
hunting-for-dns-based-persistence
threat hunting · low
hunting-for-dns-tunneling-with-zeek
threat hunting · low
hunting-for-domain-fronting-c2-traffic
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hunting-for-lateral-movement-via-wmi
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hunting-for-living-off-the-cloud-techniques
threat hunting · low
hunting-for-living-off-the-land-binaries
threat hunting · low
hunting-for-lolbins-execution-in-endpoint-logs
threat hunting · low
hunting-for-ntlm-relay-attacks
threat hunting · low
hunting-for-persistence-mechanisms-in-windows
threat hunting · low
hunting-for-persistence-via-wmi-subscriptions
threat hunting · low
hunting-for-process-injection-techniques
threat hunting · low
hunting-for-registry-persistence-mechanisms
threat hunting · low
hunting-for-registry-run-key-persistence
threat hunting · low
hunting-for-scheduled-task-persistence
threat hunting · low
hunting-for-shadow-copy-deletion
threat hunting · low
hunting-for-spearphishing-indicators
threat hunting · low
hunting-for-startup-folder-persistence
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
hunting-for-unusual-service-installations
threat hunting · low
hunting-for-webshell-activity
threat hunting · low
implementing-conduit-security-for-ot-remote-access
ot ics security · medium
implementing-diamond-model-analysis
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ot ics security · medium
implementing-gdpr-data-protection-controls
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implementing-ics-firewall-with-tofino
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implementing-security-information-sharing-with-stix2
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implementing-stix-taxii-feed-integration
threat intelligence · low
implementing-taxii-server-with-opentaxii
threat intelligence · low
implementing-threat-intelligence-lifecycle-management
threat intelligence · low
implementing-web-application-logging-with-modsecurity
web application security · medium
investigating-ransomware-attack-artifacts
digital forensics · low
managing-intelligence-lifecycle
threat intelligence · low
mapping-mitre-attack-techniques
threat intelligence · low
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-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-forensics-investigation
digital forensics · low
performing-cloud-storage-forensic-acquisition
digital forensics · low
performing-content-security-policy-bypass
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performing-credential-access-with-lazagne
red teaming · high
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performing-dark-web-monitoring-for-threats
threat intelligence · low
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performing-external-network-penetration-test
penetration testing · medium
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digital forensics · low
performing-graphql-security-assessment
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performing-http-parameter-pollution-attack
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performing-ics-asset-discovery-with-claroty
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performing-initial-access-with-evilginx3
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performing-ip-reputation-analysis-with-shodan
threat intelligence · low
performing-kerberoasting-attack
red teaming · high
performing-lateral-movement-with-wmiexec
red teaming · high
performing-linux-log-forensics-investigation
digital forensics · low
performing-log-analysis-for-forensic-investigation
digital forensics · low
performing-malware-hash-enrichment-with-virustotal
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performing-malware-ioc-extraction
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performing-malware-persistence-investigation
digital forensics · low
performing-memory-forensics-with-volatility3
digital forensics · low
performing-mobile-device-forensics-with-cellebrite
digital forensics · low
performing-network-forensics-with-wireshark
digital forensics · low
performing-network-packet-capture-analysis
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performing-nist-csf-maturity-assessment
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ot ics security · medium
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performing-physical-intrusion-assessment
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ot ics security · medium
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performing-s7comm-protocol-security-analysis
ot ics security · medium
performing-scada-hmi-security-assessment
ot ics security · medium
performing-second-order-sql-injection
web application security · medium
performing-security-headers-audit
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performing-steganography-detection
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performing-subdomain-enumeration-with-subfinder
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performing-threat-hunting-with-yara-rules
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performing-threat-intelligence-sharing-with-misp
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performing-timeline-reconstruction-with-plaso
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performing-web-cache-deception-attack
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performing-windows-artifact-analysis-with-eric-zimmerman-tools
digital forensics · low
performing-wireless-network-penetration-test
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processing-stix-taxii-feeds
threat intelligence · low
profiling-threat-actor-groups
threat intelligence · low
recovering-deleted-files-with-photorec
digital forensics · low
securing-historian-server-in-ot-environment
ot ics security · medium
securing-remote-access-to-ot-environment
ot ics security · medium
testing-api-security-with-owasp-top-10
web application security · medium
testing-cors-misconfiguration
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testing-for-broken-access-control
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web application security · medium
testing-for-email-header-injection
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testing-for-host-header-injection
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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
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testing-for-xss-vulnerabilities
penetration testing · medium
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web application security · medium
testing-for-xxe-injection-vulnerabilities
web application security · medium
testing-jwt-token-security
web application security · medium
tracking-threat-actor-infrastructure
threat intelligence · low
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