Beveiligingsadvies

CVE-2026-27656

CVE-kwetsbaarheidsdetails - eXtreme Datacenter Security Operations

Gepubliceerd 2026-03-25 16:28:29

Laatst bijgewerkt 2026-03-26 13:19:52

Toegewezen door Mattermost

CVSS-score 5.7

Status PUBLISHED

Beschrijving

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

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