CVE-2026-21388

3.7 LOW
Published: April 09, 2026 Modified: April 09, 2026
View on NVD

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

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://mattermost.com/security-updates
Source: responsibledisclosure@mattermost.com

1 reference(s) from NVD

Quick Stats

CVSS v3 Score
3.7 / 10.0
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)