CVE-2019-3911: Reflected cross-site scripting (XSS) vulnerability in LabKey Server Community Edition before 18.3.0-61806.763

Q: How do I fix CVE-2019-3911?

labkey server: upgrade to 18.3.0-61806.763. Exact commands for each OS are on this page.

Q: Is CVE-2019-3911 being exploited?

CVE-2019-3911 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-3911 affect?

CVE-2019-3911 affects labkey server. Severity is medium (CVSS 6.1). Reflected cross-site scripting (XSS) vulnerability in LabKey Server Community Edition before 18.3.0-61806.763 allows an unauthenticated remote attacker to inject arbitrary javascript via the onerror parameter in the /__r2/query endpoints.

Q: How urgent is CVE-2019-3911?

Priority 49/100. Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2019-3911 is a medium-severity flaw (CVSS 6.1) affecting labkey server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Reflected cross-site scripting (XSS) vulnerability in LabKey Server Community Edition before 18.3.0-61806.763 allows an unauthenticated remote attacker to inject arbitrary javascript via the onerror parameter in the /__r2/query endpoints.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	3.8% (top 10%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-01-30
Last modified	2026-06-17

Publisher (CNA): Tenable Network Security, Inc. · Vendor: labkey

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-01-30 20:29 UTCPublished CVE record published
2026-06-17 02:35 UTCUpdated Record last modified

labkey labkey server UPGRADE

Affected: < 18.3.0-61806.763

Fixed in: 18.3.0-61806.763

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy labkey-server || rpm -q labkey-server || labkey-server --version

2. UPGRADE to 18.3.0-61806.763 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade labkey-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade labkey-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: LabKey Server Community Edition <18.3.0 - Cross-Site Scripting

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-3911?

labkey server: upgrade to 18.3.0-61806.763. Exact commands for each OS are on this page.

Is CVE-2019-3911 being exploited?

CVE-2019-3911 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-3911 affect?

CVE-2019-3911 affects labkey server. Severity is medium (CVSS 6.1). Reflected cross-site scripting (XSS) vulnerability in LabKey Server Community Edition before 18.3.0-61806.763 allows an unauthenticated remote attacker to inject arbitrary javascript via the onerror parameter in the /__r2/query endpoints.

How urgent is CVE-2019-3911?

Priority 49/100. Public exploit reference

Related CVEs

CVE-2019-3913 MEDIUM 4.9 UPGRADE Command manipulation in LabKey Server Community Edition before 18.3.0-61806.763 allows an authenticated remote
CVE-2019-3912 MEDIUM 6.1 UPGRADE An open redirect vulnerability in LabKey Server Community Edition before 18.3.0-61806.763 via the /__r1/ retur

References

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