Vulnerabilities CVE-2026-4646

CVE-2026-4646

Medium

Open

TLP:CLEAR

Insufficient input validation in GitHub plugin API causes denial of service

NVD CVE.org

DDoS

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Description

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate user-supplied input in API request handlers which allows an authenticated attacker to crash the plugin process via a crafted HTTP request to the PR details endpoint.. Mattermost Advisory ID: MMSA-2026-00638

Details

CVSS Score: 4.3
EPSS Score ⓘ: 0.25%

16.5th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Confidence: 90%
Published: May 22, 2026
Last Modified: May 22, 2026

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