Vulnerabilities in Mattermost
512 resultsCVE-2026-28732MEDIUMSlash command trigger-word update allowed command hijackingEPSS 0.2%CVE-2026-6341MEDIUMIncomplete group locking implementationEPSS 0.2%CVE-2026-6689MEDIUM*Missing* {{invite_user}} *permission check on team creation allows unprivileged users to set open-invite and allowed-domains team settings*EPSS 0.2%CVE-2026-3590MEDIUMRace Condition in Guest Magic Link Authentication Allows Token ReuseEPSS 0.2%CVE-2026-28759MEDIUMInsufficient authorization in shared channel membership sync allows remote cluster to remove users from arbitrary channelsEPSS 0.2%CVE-2026-93846LOWTeam admin can escalate a team member's permissions via the team member roles endpointEPSS 0.2%CVE-2026-4055MEDIUMInsufficient permission validation on cross-team playbook run creationEPSS 0.2%CVE-2026-3637MEDIUMMattermost fails to enforce create_post permission when editing postsEPSS 0.2%CVE-2026-18795MEDIUMMissing server side validation allowed user to quarantine a DM and GM postEPSS 0.1%CVE-2025-62690LOWOpen redirect in error page when link opened in new tabEPSS 0.1%CVE-2023-5339MEDIUMMattermost Desktop logs all keystrokes during initial run after fresh installation EPSS 0.1%CVE-2026-3473MEDIUMImproper file ownership validation in the Boards API allows unauthorised file accessEPSS 0.1%CVE-2026-4274MEDIUMInsufficient authorization in shared channel membership sync grants team-level access instead of channel-level accessEPSS 0.1%CVE-2026-3495LOWUnescaped variables during error page compositionEPSS 0.1%CVE-2026-4286LOWPlaybooks Plugin fails to validate team transfers, allowing unauthorized removal of member access via playbook updateEPSS 0.1%CVE-2026-4273LOWInsufficient token rotation validation in remote cluster invite confirmationEPSS 0.1%CVE-2026-4339MEDIUMSSRF via unvalidated attachment URLs in Mattermost Agents plugin MCP serverEPSS 0.1%CVE-2026-28735MEDIUMGitHub OAuth Scope ValidationEPSS 0.1%CVE-2026-6333LOWSSRF via Host Header Spoofing in Custom Slash CommandsEPSS 0.1%CVE-2026-75587LOWPlaintext pre-auth secret exposure via Desktop App diagnostics reportEPSS 0.1%