CVE-2025-11776

Guest user can discover archived public channels

State: Published
Severity: 4.3 Medium
Published: Nov 14, 2025
Updated: Nov 14, 2025
Reserved: Oct 15, 2025

Description

Mattermost versions <11 fail to properly restrict access to archived channel search API which allows guest users to discover archived public channels via the `/api/v4/teams/{team_id}/channels/search_archived` endpoint

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	Mattermost

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
MattermostMattermost	<11 through <11Affected 11.0.0Not affected

References

https://mattermost.com/security-updates

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