CVE-2026-6903Network attack vector

Unauthenticated file disclosure via path traversal

Published Apr 23, 2026 · Updated Apr 23, 2026

Path traversal in Zurich Instruments LabOne before 26.01.3.9 allows remote attackers to read host files through its Web Server. The LabOne Web Server's file-access functionality fails to validate requested paths or confine them to an intended directory. Exploitation requires the Web Server to be running; direct same-network access needs no authentication, while a malicious website can trigger reads through a victim's browser.

CVSS severity8.7
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Zurich Instruments LabOne before 26.01.3.9 allows remote attackers to read host files through its Web Server. The LabOne Web Server's file-access functionality fails to validate requested paths or confine them to an intended directory. Exploitation requires the Web Server to be running; direct same-network access needs no authentication, while a malicious website can trigger reads through a victim's browser.

The record

CVE
CVE-2026-6903
Published
Apr 23, 2026
Updated
Apr 23, 2026
Vendor
Zurich Instruments
Product
LabOne
Classifications
CWE-22, CWE-346, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <26.01.3.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zurich Instruments · LabOneversion=0 <26.01.3.9

Published CVSS scores

8.7Zurich InstrumentsCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5Zurich InstrumentsCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-346Origin Validation Error
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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