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CVE PROGRAM SOURCE RECORD4.3 Medium

CVE-2026-86348

MS Calendar plugin: unrecovered handler panics from malformed post-action requests could crash the plugin process

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Status
Published
Published
Updated
Assigning organization
Mattermost

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mattermost Mattermost

Default version status: unaffected

  • <=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0 to ≤ <=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0affected
  • 11.10.0unaffected
  • 11.9.1unaffected
  • 11.8.5unaffected
  • 11.7.8unaffected
  • 10.11.23unaffected

References