CVE-2025-41443 — Missing Authorization in Mattermost Mattermost-server

CWE-862 — Missing Authorization5 documents4 sources
Severity
4.3MEDIUMNVD
EPSS
0.0%
top 98.72%
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 <= 10.5.12, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when accessing channel information which allows guest users to discover active public channels and their metadata via the `/api/v4/teams/{team_id}/channels/ids` 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_server_v8< 8.0.0-20250822090405-e8c7e7d0252b
▶CVEListV5mattermost/mattermost10.5.0 — 10.5.12+1

🔴Vulnerability Details

4
OSV
Guest user can discover active public channels in github.com/mattermost/mattermost-server↗2025-10-30
▶
OSV
Mattermost has a Missing Authorization vulnerability↗2025-10-16
▶
CVEList
Guest user can discover active public channels↗2025-10-16
▶
GHSA
Mattermost has a Missing Authorization vulnerability↗2025-10-16
▶
CVE-2025-41443 — Missing Authorization | cvebase