mattermost vulnerabilities and fixes

Q: 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.

Q: 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.

Q: Which mattermost CVE should I patch first?

CVE-2026-24661 currently ranks highest (24/100): Mattermost Plugins versions <=2.1.3.0 fail to limit the request body size on the {{/changes}} webhook endpoint.

Recent CVEs affecting mattermost, with upgrade or downgrade steps. 1 tracked.

mattermost has 1 tracked vulnerability, 0 critical. A fixed release or vendor patch exists for 1. Most recent: 2026-04-09. Highest priority: CVE-2026-24661 (score 24/100).

CVE-2026-24661 LOW 3.7 UPGRADE Mattermost Plugins versions <=2.1.3.0 fail to limit the request body size on the {{/changes}} webhook endpoint

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-2026-24661 currently ranks highest (24/100): Mattermost Plugins versions <=2.1.3.0 fail to limit the request body size on the {{/changes}} webhook endpoint.

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