CVE-2019-3826 Cross-site scripting in prometheus

What is CVE-2019-3826?

CVE-2019-3826 is a medium-severity cross-site scripting vulnerability in Redhat Openshift Container Platform, published on 26 Mar 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

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.

Weakness: CWE-79

Which versions are affected by CVE-2019-3826?

It affects 2 products.

Products include Prometheus Prometheus, Redhat Openshift Container Platform.

How do I fix CVE-2019-3826?

Upgrade to a fixed version.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2019-3826 being exploited?

There is no known exploitation of CVE-2019-3826 in the wild and no public exploit code.

Other vulnerabilities in Redhat Openshift Container Platform

• CVE-2026-42151 Prometheus Azure AD remote write OAuth client secret exposed via config API High 7.5
• CVE-2026-42154 Prometheus: remote read endpoint allows denial of service via crafted snappy payload High 7.5
• CVE-2021-29622 Arbitrary redirects under /new endpoint Medium 6.5
• CVE-2026-40179 Prometheus: Stored XSS via metric names and label values in web UI tooltips and metrics explorer Medium 5.3
• CVE-2026-44903 Prometheus: Stored XSS via crafted histogram bucket label values in the heatmap display of the old Prometheus web UI Medium 5.1

All Redhat Openshift Container Platform vulnerabilities

Sources

• CVE record
• NVD
• OSV
• How this page is made

Also known as DEBIAN-CVE-2019-3826, UBUNTU-CVE-2019-3826.