CVE-2026-10085CWE-862

Ordinary group/direct message member can enable group_constrained and remove all channel participants

Medium · published July 13, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
20.2
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 restrict the group_constrained channel flag to public and private channels that support group synchronization, which allows an ordinary group or direct message member to remove all participants from the conversation via the channel patch API.. Mattermost Advisory ID: MMSA-2026-00688

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00287 · 20.2th percentile
Weakness
CWE-862 · Missing Authorization
Published
2026-07-13T08:05Z
EPSS history
Timeline
  • 13 JUL 08:05Z
    Ordinary group/direct message member can enable group_constrained and remove all channel participants
    cvelistv5