Vulnerabilities in Mattermost
512 resultsCVE-2023-3615HIGHLack of server certificate validation in websockets connectionEPSS 0.3%CVE-2024-45833MEDIUMMobile password gets saved in dictionary under conditionsEPSS 0.3%CVE-2025-27936MEDIUMWebhook Secret Exposure via Timing attack in MSteams pluginEPSS 0.3%CVE-2024-39807LOWChannel IDs of archived/restored channels leaked via webhook eventsEPSS 0.3%CVE-2024-8071MEDIUMSystem Role with edit access to permissions can elevate themselves to system adminEPSS 0.3%CVE-2025-25068HIGHBypassing MFA Enforcement on Plugin EndpointsEPSS 0.3%CVE-2024-42497MEDIUMInsufficient permissions checks on teamsEPSS 0.3%CVE-2024-39274HIGHMalicious remote can add users to arbitrary teams and channelsEPSS 0.3%CVE-2025-2570LOWSystem Admin Cannot Access Environment settings in System Console While System Manager CanEPSS 0.3%CVE-2026-5740HIGHUnauthenticated WebSocket binary frame causes denial of service in Mattermost ServerEPSS 0.3%CVE-2026-9859MEDIUMMattermost Boards plugin didn’t enforce role-based authorization on board channel link allowing board editors to expose boards to arbitrary channelsEPSS 0.3%CVE-2023-3591MEDIUMLack of previous password reset tokens on new token creationEPSS 0.3%CVE-2024-39839MEDIUMRemote username set to an arbitrary string by remote userEPSS 0.3%CVE-2024-39353LOWRemoteClusterFrame payloads are audit logged in fullEPSS 0.3%CVE-2025-58075HIGHArbitrary Mattermost Team can be joined by manipulating the SAML RelayStateEPSS 0.3%CVE-2026-9162MEDIUMGlobal session revocation does not invalidate active WebSocket connectionsEPSS 0.3%CVE-2024-29221MEDIUMInvite ID available to team admins even without the "Add Members" permissionEPSS 0.3%CVE-2024-1887MEDIUMPublic channel post content accessible without membership when compliance export is enabledEPSS 0.3%CVE-2024-1888MEDIUMExisting server guests invited to the team by members without "invite_guest" permissionEPSS 0.3%CVE-2026-16045LOWDelegated OAuth tokens could revoke unrelated OAuth application authorizationsEPSS 0.3%