CVE-2026-27656
Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to properly validate user identity in the OpenID {{IsSameUser()}} comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user discovery flow.. Mattermost Advisory ID: MMSA-2026-00590
Vendor
Product
CWE
Yayın Tarihi
2026-03-25 17:16:56
Güncelleme
2026-03-26 18:51:38
Source Identifier
responsibledisclosure@mattermost.com
KEV Date Added
-