Incorrect Authorization Affecting github.com/mattermost/mattermost-server package, versions >=10.5.0 <10.5.11>=10.11.0 <10.11.3>=10.12.0-rc1 <10.12.0-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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Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMMATTERMOSTMATTERMOSTSERVER-13601098
- published17 Oct 2025
- disclosed16 Oct 2025
- creditlordwillmore
Introduced: 16 Oct 2025
NewCVE-2025-10545 (opens in a new tab)How to fix?
Upgrade github.com/mattermost/mattermost-server to version 10.5.11, 10.11.3, 10.12.0-rc2 or higher.
Overview
github.com/mattermost/mattermost-server is an open source Slack-alternative in Golang and React.
Affected versions of this package are vulnerable to Incorrect Authorization via the /api/v4/channels/{channel_id}/members endpoint. An attacker can gain unauthorized access to add any team members to private channels by exploiting insufficient validation of guest user permissions.