CVE-2026-2461CWE-639

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

Medium · published March 16, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
5.4
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00165 · 5.4th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-03-16T11:16Z
EPSS history
Timeline
  • 16 MAR 11:16Z
    Missing authorization check allows unauthorized modification of other users' comments on a board
    cvelistv5