Incorrect Authorization Affecting github.com/mattermost/mattermost/server/platform/services/sharedchannel package, versions >=10.11.0 <10.11.11>=11.2.0 <11.2.3>=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-GITHUBCOMMATTERMOSTMATTERMOSTSERVERPLATFORMSERVICESSHAREDCHANNEL-15855788
- published31 Mar 2026
- disclosed26 Mar 2026
- creditdaw10
Introduced: 26 Mar 2026
CVE-2026-4274 (opens in a new tab)How to fix?
Upgrade github.com/mattermost/mattermost/server/platform/services/sharedchannel to version 10.11.11, 11.2.3, 11.3.2, 11.4.1 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Authorization in the membership synchronization process. An attacker can gain unauthorized access to an entire private team by sending crafted membership synchronization messages from a remote cluster that trigger team membership assignment.