Riskcovery

CVE-2026-86348

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

State
Published
Severity
4.3 Medium
Published
Sep 14, 2026
Updated
Sep 14, 2026
Reserved
Sep 7, 2026

Read the record on cve.org

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

Scores

CVSSScoreVectorSource
3.14.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:LMattermost

Weaknesses

  • CWE-704 Incorrect Type Conversion or Cast

Affected Products

ProductVersions
MattermostMattermost
  • <=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0 through <=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0Affected
  • 11.10.0Not affected
  • 11.9.1Not affected
  • 11.8.5Not affected
  • 11.7.8Not affected
  • 10.11.23Not affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.