CVE-2025-15581 Auth bypass in orthanc
Attackers can bypass authentication to gain full administrative access to the Orthanc medical imaging server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-15581?
CVE-2025-15581 is a medium-severity authentication bypass vulnerability in orthanc-server orthanc, published on 18 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Orthanc versions before 1.12.10 are affected by an authorisation logic flaw in the application's HTTP Basic Authentication implementation.
Successful exploitation could result in Privilege Escalation, potentially allowing full administrative access.
Weakness: CWE-287
Which versions are affected by CVE-2025-15581?
How do I fix CVE-2025-15581?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2025-15581 being exploited?
There is no known exploitation of CVE-2025-15581 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-15581, DLA-4494-1, GHSA-4wvv-g662-rjm9, UBUNTU-CVE-2025-15581.