CVE-2025-27571 — Incorrect Authorization in Mattermost Mattermost-server

CWE-863 — Incorrect Authorization5 documents4 sources
Severity
4.3MEDIUMNVD
EPSS
0.2%
top 59.87%
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
PublishedApr 16
Latest updateApr 22

Description

Mattermost versions 10.5.x <= 10.5.1, 10.4.x <= 10.4.3, 9.11.x <= 9.11.9 fail to check the "Allow Users to View Archived Channels" configuration when fetching channel metadata of a post from archived channels, which allows authenticated users to access such information when a channel is archived.

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_server9.11.0 — 9.11.10+2
▶Gogithub.com/mattermost_mattermost-server9.11.0+incompatible — 9.11.10+incompatible+2
▶CVEListV5mattermost/mattermost10.5.0 — 10.5.1+2

🔴Vulnerability Details

4
OSV
Mattermost Incorrect Authorization vulnerability in github.com/mattermost/mattermost-server↗2025-04-22
▶
CVEList
Channel metadata visible in archived channels despite configuration setting↗2025-04-16
▶
OSV
Mattermost Incorrect Authorization vulnerability↗2025-04-16
▶
GHSA
Mattermost Incorrect Authorization vulnerability↗2025-04-16
▶
CVE-2025-27571 — Incorrect Authorization | cvebase