Missing Authorization Affecting github.com/mattermost/mattermost/server/channels/api4 package, versions >=10.11.0-rc1 <10.11.14-rc1>=11.4.0-rc1 <11.4.4>=11.5.0-rc1 <11.5.2-rc2
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-GITHUBCOMMATTERMOSTMATTERMOSTSERVERCHANNELSAPI4-16755172
- published19 May 2026
- disclosed18 May 2026
- credit0x7oda7123
Introduced: 18 May 2026
NewCVE-2026-3637 (opens in a new tab)How to fix?
Upgrade github.com/mattermost/mattermost/server/channels/api4 to version 10.11.14-rc1, 11.4.4, 11.5.2-rc2 or higher.
Overview
Affected versions of this package are vulnerable to Missing Authorization via the post update and patch API endpoints. An attacker can modify existing posts despite lacking posting privileges by sending crafted API requests.