CVE-2025-41443: 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…

PriorityP423medium4.3CVSS 3.1

AVNACLPRLUINSUCLINAN

EPSS

0.28%

20.5th percentile

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

Affected

7 ranges

Vendor	Product	Version range	Fixed in
github.com	mattermost_mattermost-server	>= 10.11.0 < 10.11.3	10.11.3
github.com	mattermost_mattermost-server	>= 10.5.0 < 10.5.11	10.5.11
github.com	mattermost_mattermost_server_v8	>= 0 < 8.0.0-20250822090405-e8c7e7d0252b	8.0.0-20250822090405-e8c7e7d0252b
mattermost	mattermost	10.11.0 – 10.11.2	—
mattermost	mattermost	10.5.0 – 10.5.12	—
mattermost	mattermost_server	>= 10.11.0 < 10.11.3	10.11.3
mattermost	mattermost_server	>= 10.5.0 < 10.5.11	10.5.11

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