CVE-2025-41443
Medium
Description
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
SeverityMedium
CVSS4.3
Exploit probability—
Product
Mattermost Server
PublishedOct 16, 2025
First seenOct 16, 2025
Weakness typeCWE-862Missing authorization
How to fix
Update
- mattermost mattermost_server10.5.11, 10.11.3 or later
- github.com/mattermost/mattermost/server/v88.0.0-20250822090405-e8c7e7d0252b or later
- github.com/mattermost/mattermost-server10.5.11, 10.11.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_server | 10.5.0 ≤ v < 10.5.11, 10.11.0 ≤ v < 10.11.3 | 10.5.11, 10.11.3 |
| github.com/mattermost/mattermost/server/v8Go | v < 8.0.0-20250822090405-e8c7e7d0252b | 8.0.0-20250822090405-e8c7e7d0252b |
| github.com/mattermost/mattermost-serverGo | 10.5.0 ≤ v < 10.5.11, 10.11.0 ≤ v < 10.11.3, No range specified | 10.5.11, 10.11.3 |
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