CVE-2026-6334
LOW
NVD
CVSS Score
3.1
Severity
LOW
Published
May 18, 2026
Vendor
unknown
Description
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to enforce client identity binding during the OAuth authorization code redemption flow which allows an authenticated OAuth client to redeem authorization codes issued to a different client via a crafted token exchange request.. Mattermost Advisory ID: MMSA-2026-00570