CVE-2026-24661

Unbounded Request Body Read in MS Teams Plugin {{/changes}} Webhook Endpoint

Published Apr 9, 2026 CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Description
Mattermost Plugins versions <=2.1.3.0 fail to limit the request body size on the {{/changes}} 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-2026-00611

Remediation

Vendor Solution

Update Mattermost Plugins to versions 2.3.2.0 or higher.

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-5rfv-h47g-xj42 Mattermost MS Teams plugin doesn't limit the request body size on the /changes webhook endpoint
References
History
Type Values Removed Values Added
CPEs cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
Description Mattermost Plugins versions <=2.1.3.0 fail to limit the request body size on the {{/changes}} 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-2026-00611
Title Unbounded Request Body Read in MS Teams Plugin {{/changes}} 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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Apr 9, 2026, 11:44 AM
Reserved
Feb 11, 2026, 8:56 PM
Status
Analyzed
Published
Apr 9, 2026, 11:16 AM
Modified
Jun 17, 2026, 10:23 AM