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Findings

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-actio…

Published Sep 14, 2026 · updated Oct 14, 2026 · mattermost mattermost server

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

Timeline

Detection, updates, and resolution for this record.

  1. Sep 14, 2026 · NIST NVD

    Detected

    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

  2. Oct 14, 2026 · NIST NVD

    Updated

    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

Affected

  • cpe mattermost/mattermost serverversion unspecified

Sources

  • CVE.orgVulnerability recordCVE-2026-86348

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-86348

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-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

    nvd.nist.gov

References