Caleb Roseland

**Name of the Vulnerable Software and Affected Versions** Mattermost versions 9.11.x through 9.11.8 Mattermost versions 10.3.x through 10.3.3 Mattermost versions 10.4.x through 10.4.2 Mattermost versions 10.5.x through 10.5.0 **Description** The issue allows authenticated users to create or update bookmarks in archived channels, as the affected versions of Mattermost do not properly restrict bookmark creation and updates in such channels. **Recommendations** For versions 9.11.x through 9.11.8, update to a version that restricts bookmark creation and updates in archived channels. For versions 10.3.x through 10.3.3, update to a version that restricts bookmark creation and updates in archived channels. For versions 10.4.x through 10.4.2, update to a version that restricts bookmark creation and updates in archived channels. For versions 10.5.x through 10.5.0, update to a version that restricts bookmark creation and updates in archived channels.