CVE-2026-6903 Path Traversal Vulnerability in LabOne User Interface
Unauthenticated attackers can read arbitrary files via path traversal in the LabOne Web Server, which must be running for exploitation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-6903?
CVE-2026-6903 is a high-severity path traversal vulnerability in Zurich Instruments LabOne, published on 23 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The LabOne Web Server, backing the LabOne User Interface, contains insufficient input validation in its file access functionality. An unauthenticated attacker could exploit this vulnerability to read arbitrary files on the host system that are accessible to the operating system user running the LabOne software.
Additionally, the Web Server does not sufficiently restrict cross-origin requests, which could allow a remote attacker to trigger file access from a victim's browser by directing the victim to a malicious website.
The vulnerability is only exploitable when the LabOne Web Server is running. Installations using only the LabOne APIs without starting the Web Server are not exposed.
Which versions are affected by CVE-2026-6903?
How do I fix CVE-2026-6903?
No fix has been published for CVE-2026-6903 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-6903 being exploited?
There is no known exploitation of CVE-2026-6903 in the wild and no public exploit code.
Sources
Also known as GHSA-42m2-x7rv-fg34.