PatchTheCVEmattermost vulnerabilities
Recent CVEs affecting mattermost products. 1 tracked.
mattermost has 1 tracked vulnerability, 0 critical. A fixed release or vendor patch exists for 0. Most recent: 2026-04-03. Highest priority: CVE-2026-28736 (score 20/100).
- CVE-2026-28736 MEDIUM 4.3 DOWNGRADE ** UNSUPPORTED WHEN ASSIGNED ** Focalboard version 8.0 fails to validate file ownership when serving uploaded
FAQ
How do I fix mattermost vulnerabilities?
Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.
Is mattermost being exploited right now?
None of the tracked mattermost CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.
Which mattermost CVE should I patch first?
CVE-2026-28736 currently ranks highest (20/100): ** UNSUPPORTED WHEN ASSIGNED ** Focalboard version 8.0 fails to validate file ownership when serving uploaded .