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GHSA-FMQF-PMCM-8CX9 Mattermost doesn't validate user channel membership when attaching Mattermost posts as comments to Jira issues

🗓️ 24 Dec 2025 09:30:22Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 6 Views

Mattermost fails to validate channel membership when attaching posts as Jira comments, exposing restricted content to attackers.

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27 Feb 2026 22:04Current
6.5Medium risk
Vulners AI Score6.5
CVSS 3.14.3
EPSS0.00168
6