What is CVE-2019-3826?

CVE-2019-3826 is a medium-severity vulnerability in Prometheus, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-03-26.

How severe is CVE-2019-3826?

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

Is CVE-2019-3826 known to be exploited?

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

XSS in Prometheus

CVE-2019-3826

A stored, DOM based, cross-site scripting (XSS) flaw was found in Prometheus before version 2.7.1. An attacker could exploit this by convincing an authenticated user to visit a crafted URL on a Prometheus server, allowing for the execution and persistent storage of arbitrary scripts.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-03-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.026 (84.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.027 · newest: 0.026 · change: -0.001

Affected products

Prometheus
[Unknown] Prometheus — versions 2.7.1
Red Hat Openshift Container Platform — versions 3.11

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

Bhanunamikaze/VaktScan

References

bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
github.com/prometheus/prometheus/pull/5163 (Patch, Third Party Advisory)
github.com/prometheus/prometheus/commit/62e591f9 (Patch, Third Party Advisory)
access.redhat.com/errata/RHBA-2019:0327 (vendor-advisory, Third Party Advisory)
lists.apache.org/thread.html/rdf2a0d94c3b5b523aeff7741ae71347415276062811b687f3… (mailing-list)
lists.apache.org/thread.html/r8e3f7da12bf5750b0a02e69a78a61073a2ac950eed7451ce7… (mailing-list)
lists.apache.org/thread.html/r48d5019bd42e0770f7e5351e420a63a41ff1f16924942442c… (mailing-list)
advisory.checkmarx.net/advisory/CX-2019-4297

Frequently asked questions

What is CVE-2019-3826?: CVE-2019-3826 is a medium-severity vulnerability in Prometheus, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-03-26.
How severe is CVE-2019-3826?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2019-3826 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.