Incorrect Authorization Affecting github.com/mattermost/mattermost/server/channels/api4 package, versions <10.11.11>=11.2.0-rc1 <11.2.3>=11.3.0-rc1 <11.3.1
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-GITHUBCOMMATTERMOSTMATTERMOSTSERVERCHANNELSAPI4-15702174
- published20 Mar 2026
- disclosed16 Mar 2026
- credithackit_bharat
Introduced: 16 Mar 2026
NewCVE-2026-26230 Â (opens in a new tab)How to fix?
Upgrade github.com/mattermost/mattermost/server/channels/api4 to version 10.11.11, 11.2.3, 11.3.1 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Authorization due to insufficient validation of permission requirements in the team member roles API endpoint. An attacker can gain unauthorized privilege to demote users to guest status by exploiting this flaw while authenticated as a team administrator.