CVE-2024-39274 Information

Description

Mattermost versions 9.9.x <= 9.9.0 9.5.x <= 9.5.6 9.7.x <= 9.7.5 and 9.8.x <= 9.8.1 fail to properly validate that the channel that comes from the sync message is a shared channel when shared channels are enabled which allows a malicious remote to add users to arbitrary teams and channels

Reference

https://mattermost.com/security-updates