Vulnerabilities in Mattermost
512 resultsCVE-2025-2527MEDIUMImproper access control to group informationEPSS 0.3%CVE-2026-25773HIGHFocalboard Second-Order SQL Injection in category reorder endpoint allows data exfiltration (unsupported product, no fix)EPSS 0.3%CVE-2025-41443MEDIUMGuest user can discover active public channelsEPSS 0.3%CVE-2025-53514MEDIUMUnexpected Input to Server Webhook endpoint Causes DoS in Mattermost Confluence PluginEPSS 0.3%CVE-2024-39772LOWSilent Desktop Screenshot CaptureEPSS 0.3%CVE-2024-21848LOWUsers maintain access to active call after being removed from a channelEPSS 0.3%CVE-2026-26233MEDIUMDenial of Service via HTTP/2 single packet attack on login endpointEPSS 0.3%CVE-2023-45316HIGHReflected client side path traversal leading to CSRF in PlaybooksEPSS 0.3%CVE-2025-41410MEDIUMSlack import bypasses email verification for team access controlsEPSS 0.3%CVE-2026-7387HIGHMattermost group syncable endpoints allow privilege escalation via scheme_adminEPSS 0.3%CVE-2024-2445MEDIUMReflected XSS in Mattermost Jira pluginEPSS 0.3%CVE-2025-14435MEDIUMApplication-Level DoS via infinite re-render loop in user profile handlingEPSS 0.3%CVE-2026-6961HIGHCVE-2026-6961: Path traversal via unsanitized FileInfo.Name in Mattermost federation syncEPSS 0.3%CVE-2026-9571MEDIUMDeactivated user accounts can continue to obtain valid OAuth access tokens via refresh token grant in MattermostEPSS 0.3%CVE-2025-58084LOWMattermost Desktop App crashes when clicking on malformed external URLEPSS 0.3%CVE-2024-36257LOWLack of permission check when updating the profile picture of a remote user (shared channels enabled)EPSS 0.3%CVE-2026-25783MEDIUMDenial of service via malformed User-Agent header in getBrowserVersionEPSS 0.3%CVE-2026-3109LOWMissing timestamp validation in Zoom webhook handlerEPSS 0.3%CVE-2025-11794MEDIUMPassword hash and MFA secret returned in user email verification endpointEPSS 0.3%CVE-2025-49222MEDIUMMattermost Shared Channel Upload Type Validation BypassEPSS 0.3%