Mattermost Plugins versions <=11.4 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to validate incoming request size which allows an authenticated attacker to cause service disruption via the webhook endpoint. Mattermost Advisory ID: MMSA-2026-00589

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Advisories

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Fixes

Solution

Update Mattermost Plugins to versions 11.5.0, 11.4.1, 11.3.2, 11.2.4, 10.11.12 or higher.


Workaround

No workaround given by the vendor.

References
History

Mon, 08 Jun 2026 12:30:00 +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

Fri, 27 Mar 2026 08:45:00 +0000

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

Thu, 26 Mar 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Thu, 26 Mar 2026 16:45:00 +0000

Type Values Removed Values Added
Description Mattermost Plugins versions <=11.4 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to validate incoming request size which allows an authenticated attacker to cause service disruption via the webhook endpoint. Mattermost Advisory ID: MMSA-2026-00589
Title Improper Input Validation in Zoom Plugin Webhook Handler
Weaknesses CWE-400
References
Metrics cvssV3_1

{'score': 4.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2026-03-26T17:51:14.971Z

Reserved: 2026-02-24T11:10:17.757Z

Link: CVE-2026-3116

cve-icon Vulnrichment

Updated: 2026-03-26T17:47:33.539Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-26T17:16:42.823

Modified: 2026-06-08T12:20:59.363

Link: CVE-2026-3116

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-27T09:26:25Z

Weaknesses