Mattermost Legal Hold vulnerabilities
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Published CVEs affecting Mattermost Legal Hold: 2 record(s), with affected versions and fixes.cpe:2.3:a:mattermost:legal_hold
CVE-2026-6957
Medium · 4.9
CWE-22 May 27, 2026
Path traversal in Mattermost Legal Hold plugin via unsanitized file name from federated peer allows arbitrary file write.
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-2026-00659
CVE-2026-3524
High · 8.8
CWE-862 Apr 6, 2026
Authorization Bypass in Mattermost Legal Hold Plugin Due to Missing Return After Permission Check
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