Mattermost Plugins versions <=2.3.1 fail to limit the request body size on the {{/lifecycle}} webhook endpoint which allows an authenticated attacker to cause memory exhaustion and denial of service via sending an oversized JSON payload. Mattermost Advisory ID: MMSA-2026-00610

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Advisories

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Fixes

Solution

Update Mattermost Plugins to versions 2.3.2.0 or higher.


Workaround

No workaround given by the vendor.

References
History

Thu, 09 Apr 2026 10:30:00 +0000

Type Values Removed Values Added
Description Mattermost Plugins versions <=2.3.1 fail to limit the request body size on the {{/lifecycle}} webhook endpoint which allows an authenticated attacker to cause memory exhaustion and denial of service via sending an oversized JSON payload. Mattermost Advisory ID: MMSA-2026-00610
Title Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}} Webhook Endpoint
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2026-04-09T11:44:54.614Z

Reserved: 2026-02-11T20:56:06.579Z

Link: CVE-2026-21388

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-04-09T11:16:20.897

Modified: 2026-04-09T11:16:20.897

Link: CVE-2026-21388

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses