CVE-2026-4646
MEDIUM
mattermost
mattermost_server
NVD
CVSS Score
4.3
Severity
MEDIUM
Published
May 22, 2026
Vendor
mattermost
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