CVE-2025-10545CWE-863broken-access-control

CVE-2025-10545

Low · published October 16, 2025

CVSS v3.1
3.1
EPSS
0%
Percentile
24.4
In the wild
Unconfirmed
What it is

Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the `/api/v4/channels/{channel_id}/members` endpoint

The record
Technical detail
CVSS v3.1
3.1 · LOW
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00326 · 24.4th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2025-10-16T13:15Z
Affected products (2)
ProductVersionsFixed in
mattermost/mattermost_server≥ 10.5.0, < 10.5.1110.5.11
mattermost/mattermost_server≥ 10.11.0, < 10.11.310.11.3
References (1)
https://mattermost.com/security-updates · [email protected]
EPSS history
Timeline
  • 16 OCT 08:24Z
    Guest user can add unauthorized team users to private channels
    cvelistv5