Mattermost Multiple Vulnerabilities CVSS 7.3 High

CERT-Bund issued a high-severity security advisory identifying multiple vulnerabilities in Mattermost messaging platform that could enable unspecified remote attacks. The affected versions span multiple release branches across Mattermost Server and Plugins. CVSS Base Score is 7.3 (High) with Temporal Score of 6.4 (Medium), and remote exploitation is confirmed possible.

Organizations running Mattermost deployments on Linux, UNIX, Windows, or other platforms should immediately identify which versions are in use and prioritize applying available patches or mitigations. The web-based instant messaging service is widely used for team communications, making this a significant exposure for affected enterprises. Security teams should treat this as a priority patch cycle given the high CVSS score and confirmed remote attack vector.