CVE-2026-86348

Mattermost versions <=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0 fail to recover from handler panics, which allows an authenticated user to crash the plugin via a post-action request with an unexpected field type.. Mattermost Advisory ID: MMSA-2026-00701

  • Published Sep 14, 2026
  • CVSS 4.3 medium
  • 0.4% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-86348 at the National Vulnerability Database