EUVD-2026-12411
GHSA-hf8w-x9h5-5gf9
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Lifecycle Timeline
4Description
Mattermost Plugins versions <=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members. Mattermost Advisory ID: MMSA-2025-00559
Analysis
Mattermost Plugins versions 11.3 and earlier fail to implement proper authorization checks on comment block modifications, allowing authenticated users with editor permissions to modify comments created by other board members without restriction. An authorized attacker can alter or tamper with comments from colleagues, potentially modifying project records, discussions, or audit trails. …
Sign in for full analysis, threat intelligence, and remediation guidance.
Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
Sign in for detailed remediation steps.
Priority Score
Vendor Status
Share
External POC / Exploit Code
Leaving vuln.today