Disclosure summary
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.
Source-reported weakness categories
CWE-620
Source-specific records & product guidance
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NIST NVD · NVD-CVE-2025-62425
Open original source · Updated Oct 09, 2026
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Original records & references
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- element-hq/matrix-authentication-service CVE record citation
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Discovery progress
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PUBLISHED 2025-10-16T19:15:35+00:00
MODIFIED 2026-10-09T10:10:00+00:00
INGESTED 2026-10-11T00:50:24+00:00