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CVE-2026-6957

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

CVSS 3.1 · 8 High EPSS < 1% KEV · Not listed
Vendors
Mattermost
Products
Legal Hold Mattermost
CVE-2026-3524

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

CVSS 3.1 · 8.3 High EPSS < 1% KEV · Not listed
Vendors
Mattermost
Products
Legal Hold Mattermost