Mattermost Legal Hold vulnerabilities

2 vulnerabilities

Known vulnerabilities in Mattermost Legal Hold, newest first, with CVSS severity, EPSS, KEV listings, ransomware use and the affected versions.

8CVE-2026-6957mattermostlegal_hold+1
EPSS score
0.46%
Mattermost Plugins versions <=1.1.5 fail to sanitize filenames received from federated peers before using them to construct export destination paths, which allows an administrator of a remote federated Mattermost server to write files to arbitrary locations within the target server's filestore via a malicious filename delivered through the shared-channel attachment sync protocol. Mattermost Advisory ID: MMSA-2026-006598.8CVE-2026-3524mattermostlegal_hold+1
EPSS score
0.42%
Mattermost Plugin Legal Hold versions <=1.1.4 fail to halt request processing after a failed authorization check in ServeHTTP which allows an authenticated attacker to access, create, download, and delete legal hold data via crafted API requests to the plugin's endpoints. Mattermost Advisory ID: MMSA-2026-00621