Path Traversal in Zurich Instruments Labone
CVE-2026-6903
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (21.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.000
Affected products
- Zurich Instruments Labone — versions 0
Weakness classification (CWE)
References
- www.zhinst.com/support/security/2026/zi-sa-2026-001/ (vendor-advisory)
- www.zhinst.com/support/download-center/ (patch)
Frequently asked questions
- What is CVE-2026-6903?
- CVE-2026-6903 is a high-severity vulnerability in Zurich Instruments Labone, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-04-23.
- How severe is CVE-2026-6903?
- High severity. CVSS v3 base score is 7.5 out of 10.