CVE-2025-10545 — Incorrect Authorization in Mattermost Mattermost-server

CWE-863 — Incorrect Authorization5 documents4 sources
Severity
4.3MEDIUMNVD
CNA3.1
EPSS
0.0%
top 99.24%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Github.com Mattermost Mattermost-serverGithub.com Mattermost Mattermost Server V8Mattermost Server+1 more
Timeline
PublishedOct 16
Latest updateOct 30

Description

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

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:NExploitability: 2.8 | Impact: 1.4

Affected Packages4 packages

▶NVDmattermost/mattermost_server10.5.0 — 10.5.11+1
▶Gogithub.com/mattermost_mattermost-server10.5.0+incompatible — 10.5.11+incompatible+3
▶Gogithub.com/mattermost_mattermost_server_v8< 8.0.0-20250820115038-ff30b84049f0
▶CVEListV5mattermost/mattermost10.5.0 — 10.5.10+1

🔴Vulnerability Details

4
OSV
Mattermost has an Incorrect Authorization vulnerability in github.com/mattermost/mattermost-server↗2025-10-30
▶
CVEList
Guest user can add unauthorized team users to private channels↗2025-10-16
▶
GHSA
Mattermost has an Incorrect Authorization vulnerability↗2025-10-16
▶
OSV
Mattermost has an Incorrect Authorization vulnerability↗2025-10-16
▶
CVE-2025-10545 — Incorrect Authorization | cvebase