CVE-2026-2461 — Missing authorization check allows unauthorized modification of other users' comments on a board

CVE-2026-2461

Missing authorization check allows unauthorized modification of other users' comments on a board PUBLISHED

Description (CNA)

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

Affected (CNA)

Vendor / product	Versions
Mattermost / Mattermost	affected 0 through 11.0.3; affected 0 through 11.2.2; affected 0 through 10.10.11; unaffected 11.4.0; unaffected 11.3.1; unaffected 11.2.3; unaffected 10.11.11

CWE

CWE-639

References

https://mattermost.com/security-updates

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.