Incorrect Authorization Affecting github.com/mattermost/mattermost/server/channels/app package, versions >=10.11.0 <10.11.12>=11.2.0 <11.2.4>=11.3.0 <11.3.2>=11.4.0 <11.4.1
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-GITHUBCOMMATTERMOSTMATTERMOSTSERVERCHANNELSAPP-15855854
- published31 Mar 2026
- disclosed26 Mar 2026
- creditwinfunc
Introduced: 26 Mar 2026
CVE-2026-3115 (opens in a new tab)How to fix?
Upgrade github.com/mattermost/mattermost/server/channels/app to version 10.11.12, 11.2.4, 11.3.2, 11.4.1 or higher.
Overview
github.com/mattermost/mattermost/server/channels/app is a private-cloud Slack alternative
Affected versions of this package are vulnerable to Incorrect Authorization via the group retrieval endpoint. An attacker can enumerate user IDs outside their allowed visibility scope by sending requests as an authenticated guest user.