Race Condition Affecting github.com/mattermost/mattermost/server/channels/app package, versions >=10.11.0-rc1 <10.11.15-rc1>=11.4.0-rc1 <11.4.5>=11.5.0-rc1 <11.5.4>=11.6.0-rc1 <11.6.1-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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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMMATTERMOSTMATTERMOSTSERVERCHANNELSAPP-16873781
- published24 May 2026
- disclosed22 May 2026
- creditdaw10
Introduced: 22 May 2026
CVE-2026-4635 (opens in a new tab)How to fix?
Upgrade github.com/mattermost/mattermost/server/channels/app to version 10.11.15-rc1, 11.4.5, 11.5.4, 11.6.1-rc1 or higher.
Overview
github.com/mattermost/mattermost/server/channels/app is a private-cloud Slack alternative
Affected versions of this package are vulnerable to Race Condition in the process responsible for handling persistent notifications due to a failure to archive the channel before removing existing notifications. An attacker can cause the server to crash by timing the creation of a persistent notification message between the deletion of existing notifications and the archiving of the channel.