GHSA-j6gg-r5jc-47cm

ghsaUSosv

Mattermost fails to properly restrict access to archived channel search API

view advisory published 2025-11-14Licence: CC-BY-4.0

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

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2025-11776US	—OT elevated	0.21% (11th)	—	2025-11-14
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_i…

references

External citations — patches, advisories, analysis.

https://github.com/mattermost/mattermost/commit/c8d66301415d5b447df0e829bdbaa92e8a83ecf8WEB
https://mattermost.com/security-updatesWEB
https://nvd.nist.gov/vuln/detail/CVE-2025-11776ADVISORY

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