CVE-2025-62425: Element-Hq Matrix-Authentication-Service

High severity, CVSS 8.3. EPSS: 0.4% chance of exploitation in the next 30 days.

MAS (Matrix Authentication Service) is a user management and authentication service for Matrix homeservers, written and maintained by Element. A logic flaw in matrix-authentication-service 0.20.0 through 1.4.0 allows an attacker with access to an authenticated MAS session to perform sensitive operations without entering the current password. These include changing the current password, adding or removing an e-mail address and deactivating the account. The vulnerability only affects instances which have the local password database feature enabled (passwords section in the config). Patched in matrix-authentication-service 1.4.1.

Affected products

• Element-Hq Matrix-Authentication-Service: from 0.20.0, up to and including 1.4.0

Published 2025-10-16. Last modified 2026-10-09.