CVE-2025-61940 Mirion Medical EC2 Software NMIS BioDose Use of Client-Side Authentication

High 8.7 Published 2 Dec 2025 Updated 9 Dec 2025

Attackers can bypass client-side authentication to access the database directly using a shared SQL Server account, exposing sensitive medical dosimetry data.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-61940?

CVE-2025-61940 is a high-severity authentication bypass vulnerability in Mirion Medical EC2 Software NMIS BioDose, published on 2 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

NMIS/BioDose V22.02 and previous versions rely on a common SQL Server user account to access data in the database. User access in the client application is restricted by a password authentication check in the client software but the underlying database connection always has access. The latest version of NMIS/BioDose introduces an option to use Windows user authentication with the database, which would restrict this database connection.

Weakness: CWE-603

Which versions are affected by CVE-2025-61940?

It affects 1 product.

Products include Mirion Biodose\/Nmis.

How do I fix CVE-2025-61940?

No fix has been published for CVE-2025-61940 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2025-61940 being exploited?

There is no known exploitation of CVE-2025-61940 in the wild and no public exploit code.

Sources

Also known as GHSA-m839-8xgr-vqhm.