Missing Authorization

Overview Affected versions of this package are vulnerable to Missing Authorization via the post update and patch API endpoints. An attacker can modify existing posts despite lacking posting privileges by sending crafted API requests. Remediation Upgrade...

GHSA-V549-XX3C-6PC8 Mattermost doesn't check the create_post channel permission during post edit operations

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13, 11.4.x = 11.4.3 fail to check the createpost channel permission during post edit operations which allows an authenticated attacker with revoked posting privileges to modify their existing posts via direct API requests to the post update and...

Mattermost doesn't check the create_post channel permission during post edit operations

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13, 11.4.x = 11.4.3 fail to check the createpost channel permission during post edit operations which allows an authenticated attacker with revoked posting privileges to modify their existing posts via direct API requests to the post update and...

CVE-2026-3637 Mattermost fails to enforce create_post permission when editing posts

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13, 11.4.x = 11.4.3 fail to check the createpost channel permission during post edit operations which allows an authenticated attacker with revoked posting privileges to modify their existing posts via direct API requests to the post update and...

CVE-2026-45229 Quark Drive (quark-auto-save) < 0.8.5 Mass Assignment via POST /update

Quark Drive before 0.8.5 contains a mass assignment vulnerability in the POST /update endpoint that allows authenticated attackers to overwrite administrator credentials by posting an arbitrary webui object to the configdata dictionary. Attackers can exploit insufficient deny-list filtering to...

Origin Validation Error

Overview Affected versions of this package are vulnerable to Origin Validation Error via the post update API endpoint when client-supplied post metadata is not properly sanitized. An attacker can impersonate other users and spoof permalink embeds by sending crafted PUT requests. Remediation Upgra...

Mattermost allows attackers to spoof permalink embeds

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2, 10.11.x = 10.11.10 fail to sanitize client-supplied post metadata which allows an authenticated attacker to spoof permalink embeds impersonating other users via crafted PUT requests to the post update API endpoint. Mattermost Advisory ID:...

CVE-2026-2457 WebSocket Message Spoofing via Permalink Embed Manipulation

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2, 10.11.x = 10.11.10 fail to sanitize client-supplied post metadata which allows an authenticated attacker to spoof permalink embeds impersonating other users via crafted PUT requests to the post update API endpoint.. Mattermost Advisory ID:...