WID-SEC-W-2025-2434

csafDEcert_bund

DeutschShown in its original language — a full translation is planned for a future version.

Mattermost Server: Mehrere Schwachstellen ermöglichen die Umgehung von Sicherheitsmaßnahmen

view advisory published 2025-10-28

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen im Mattermost Server ausnutzen, um Sicherheitsmaßnahmen zu umgehen und so eine Kontoübernahme durchzuführen.

01

describes (2)

Related CVEs.

IDseverity exploitable
CVE-2025-12421US——
Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to to verify that the token used during the code exchange originates from the s…
CVE-2025-12419US——
Mattermost versions 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12, 11.0.x <= 11.0.3 fail to properly validate OAuth state tokens during OpenID Connect authentication wh…
02

references

External citations — patches, advisories, analysis.

scry

Advisories like this name the exposed products attackers go after on your perimeter. See what is exposed on your perimeter with a free passive scan.

Free scan