Missing Authentication for Critical Function Affecting github.com/mattermost/mattermost/server/channels/app package, versions >=9.11.0 <9.11.17-rc1>=10.5.0 <10.5.7>=10.7.0 <10.7.4-rc1>=10.8.0 <10.8.2
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-10874221
- published22 Jul 2025
- disclosed18 Jul 2025
- creditDawid Kulikowski
Introduced: 18 Jul 2025
NewCVE-2025-6226 (opens in a new tab)How to fix?
Upgrade github.com/mattermost/mattermost/server/channels/app to version 9.11.17-rc1, 10.5.7, 10.7.4-rc1, 10.8.2 or higher.
Overview
github.com/mattermost/mattermost/server/channels/app is a private-cloud Slack alternative
Affected versions of this package are vulnerable to Missing Authentication for Critical Function in the deduplicateCreatePost method. An attacker can access posts in private channels without proper authorization by guessing the PendingPostID of recently created posts.