EUVD-2026-12385
GHSA-fx49-m253-27jj
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Lifecycle Timeline
4Description
Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to filter invite IDs based on user permissions, which allows regular users to bypass access control restrictions and register unauthorized accounts via leaked invite IDs during team creation.. Mattermost Advisory ID: MMSA-2025-00565
Analysis
Mattermost fails to properly validate user permissions when filtering invite IDs during team creation, allowing authenticated users to bypass access controls and register unauthorized accounts using leaked or discovered invite tokens. Affected versions include Mattermost 11.3.0 and earlier in the 11.3.x branch, 11.2.2 and earlier in the 11.2.x branch, and 10.11.10 and earlier in the 10.11.x branch. …
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