Incorrect Authorization Affecting github.com/mattermost/mattermost/server/channels/api4 package, versions >=10.5.0 <10.5.12-rc1>=10.11.0 <10.11.4-rc1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMMATTERMOSTMATTERMOSTSERVERCHANNELSAPI4-14038235
- published16 Nov 2025
- disclosed13 Nov 2025
- creditUnknown
Introduced: 13 Nov 2025
NewCVE-2025-11777 (opens in a new tab)How to fix?
Upgrade github.com/mattermost/mattermost/server/channels/api4 to version 10.5.12-rc1, 10.11.4-rc1 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Authorization due to properly validating team membership permissions in the Add Channel Member API. An attacker can obtain unauthorized access to user metadata and channel membership information from other teams by sending crafted API requests.