CVE-2026-2461
Missing authorization check allows unauthorized modification of other users' comments on a board
- Published
- Mar 16, 2026
- Updated
- Mar 16, 2026
- Assigning CNA
- Mattermost
- Evidence observed
- Aug 25, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:NLow · next 30 days
- Percentile
- 5.8%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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
Sources
1Python proof-of-concept demonstrating exploitation of CVE-2026-2461 for security research and testing.
Responsible use
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