Insertion of Sensitive Information Into Sent Data Affecting github.com/mattermost/mattermost/server/v8/channels/app package, versions >=10.11.0-rc1 <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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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMMATTERMOSTMATTERMOSTSERVERV8CHANNELSAPP-15682907
- published18 Mar 2026
- disclosed16 Mar 2026
- creditUnknown
Introduced: 16 Mar 2026
CVE-2026-2578 (opens in a new tab)How to fix?
Upgrade github.com/mattermost/mattermost/server/v8/channels/app to version 10.11.11, 11.2.3, 11.3.1 or higher.
Overview
Affected versions of this package are vulnerable to Insertion of Sensitive Information Into Sent Data via the WebSocket post deletion event. An attacker can access unrevealed message contents by intercepting or listening to these events after deletion.