Operation on a Resource after Expiration or Release Affecting github.com/mattermost/mattermost/server/channels/api4 package, versions >=10.11.0-rc1 <10.11.14-rc1>=11.5.0-rc1 <11.5.2-rc2>=11.6.0-rc1 <11.6.0-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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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMMATTERMOSTMATTERMOSTSERVERCHANNELSAPI4-16777258
- published20 May 2026
- disclosed15 May 2026
- creditse1en
Introduced: 15 May 2026
NewCVE-2026-4053 (opens in a new tab)How to fix?
Upgrade github.com/mattermost/mattermost/server/channels/api4 to version 10.11.14-rc1, 11.5.2-rc2, 11.6.0-rc2 or higher.
Overview
Affected versions of this package are vulnerable to Operation on a Resource after Expiration or Release due to the failure to enforce the PostEditTimeLimit in the post patch and update API endpoints. An attacker can alter file attachments, properties, and pin status of posts after the allowed edit window by sending crafted API requests.