CVE-2026-10106CWE-863

Unauthorized users can trigger interactive post actions in private channels via action cookie channel mismatch in Mattermost

Medium · published July 13, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
21.5
In the wild
Unconfirmed
What it is

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify that the channel referenced in an action cookie matches the channel of the target post, which allows an authenticated user without access to a private channel to trigger interactive post actions on posts in that channel via a cookie obtained from any accessible channel.. Mattermost Advisory ID: MMSA-2026-00690

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00299 · 21.5th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-07-13T08:09Z
EPSS history
Timeline
  • 13 JUL 08:09Z
    Unauthorized users can trigger interactive post actions in private channels via action cookie channel mismatch in Mattermost
    cvelistv5