What is CVE-2019-3911?

CVE-2019-3911 is a medium-severity vulnerability in Labkey Server, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-01-30.

How severe is CVE-2019-3911?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2019-3911 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Labkey Server

CVE-2019-3911

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-01-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.038 (89.7th percentile), scored 2026-09-28.

Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 89.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.038 · newest: 0.038 · change: 0.000

Affected products

Labkey Server
Tenable Labkey Server Community Edition — versions Versions before 18.3.0-61806.763

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

www.tenable.com/security/research/tra-2019-03 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-3911?: CVE-2019-3911 is a medium-severity vulnerability in Labkey Server, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-01-30.
How severe is CVE-2019-3911?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2019-3911 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.