CVE-2026-4646

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CVSS 3.1

4.3 medium

EPSS

<1%p16

Published

May 22, 2026 (May 22, 2026)

Modified

Jul 23, 2026

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

Vendors: mattermost
Products: mattermost server
Weakness: CWE-1287
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

NVD CVE.org GitHub PoCs EPSS (0.3%)

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