PT-2025-46945 · Mattermost · Mattermost

Lordwillmore · Published 2025-10-15 · Updated 2025-11-17 · CVE-2025-11776

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions Mattermost versions prior to 11

Description The software does not properly restrict access to the archived channel search API. This allows guest users to discover archived public channels using the /api/v4/teams/{team id}/channels/search archived API endpoint. The vulnerable parameter is team id.

Recommendations Update to version 11 or later.

Fix

Incorrect Authorization

Improper Access Control

Weakness Enumeration

CWE-863

CWE-284

Related Identifiers

BDU:2025-16013

CVE-2025-11776

GHSA-J6GG-R5JC-47CM

GO-2025-4126

Affected Products

Mattermost

References · 11

• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-11776 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2025-4126 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-j6gg-r5jc-47cm · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-16013 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-11776 · Security Note
• https://github.com/mattermost/mattermost/commit/c8d66301415d5b447df0e829bdbaa92e8a83ecf8 · Note
• https://github.com/advisories/GHSA-j6gg-r5jc-47cm · Note
• https://t.me/CVEtracker/37320 · Telegram Post
• https://twitter.com/CVEnew/status/1989261509571301621 · Twitter Post
• https://reddit.com/r/VulnMatter/comments/1oxcbz9/resumen_diario_de_vulnerabilidades_14112025 · Reddit Post