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
References
History

Wed, 14 Oct 2026 19:45:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Vendors & Products Mattermost mattermost Server

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 14 Sep 2026 14:00:00 +0000

Type Values Removed Values Added
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
Title MS Calendar plugin: unrecovered handler panics from malformed post-action requests could crash the plugin process
Weaknesses CWE-704
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published: 2026-09-14T13:52:24.602Z

Updated: 2026-09-14T19:23:01.298Z

Reserved: 2026-09-07T09:35:28.446Z

Link: CVE-2026-86348

cve-icon Vulnrichment

Updated: 2026-09-14T19:15:28.648Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-14T14:17:15.570

Modified: 2026-10-14T19:28:53.743

Link: CVE-2026-86348

cve-icon Redhat

No data.