Incorrect Authorization Affecting github.com/mattermost/mattermost/server/v8/platform/services/remotecluster package, versions >=10.11.0-rc1 <10.11.14-rc1>=11.5.0-rc1 <11.5.2-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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Incorrect Authorization vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMMATTERMOSTMATTERMOSTSERVERV8PLATFORMSERVICESREMOTECLUSTER-16778841
- published20 May 2026
- disclosed18 May 2026
- creditdaw10
Introduced: 18 May 2026
CVE-2026-4273 (opens in a new tab)How to fix?
Upgrade github.com/mattermost/mattermost/server/v8/platform/services/remotecluster to version 10.11.14-rc1, 11.5.2-rc1 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Authorization in the invite confirmation process due to insufficient validation of the RefreshedToken. An attacker can bypass intended token rotation and reuse an original invite token by sending a crafted invite confirmation where the RefreshedToken matches the original token.