Kurz gesagt
- CVE-2026-27656 ist eine Schwachstelle (MITTEL (CVSS 6.1)) in github.com/mattermost/mattermost-server, github.com/mattermost/mattermost-server/v5, github.com/mattermost/mattermost-server/v6.
- Wahrscheinlichkeit einer Ausnutzung in den nächsten 30 Tagen (EPSS): 0.18%, höher als bei 7.9% aller Schwachstellen.
- Abhilfe: auf 10.11.12, 10.11.12+incompatible, 11.2.4, 11.2.4+incompatible oder neuer aktualisieren.
Description
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
NVD description
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
Weitere Schwachstellen in github.com/mattermost/mattermost-server
Alle anzeigen →Running one of these products? Scan your site to see whether it exposes a vulnerable version.
Scan my site free