CVE-2026-40179 — Cross-site Scripting in Prometheus

CWE-79 — Cross-site Scripting4 documents4 sources
Severity
5.3MEDIUMNVD
EPSS
0.0%
top 97.25%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
PrometheusGithub.com Prometheus Prometheus
Timeline
PublishedApr 15
Latest updateApr 16

Description

Prometheus is an open-source monitoring system and time series database. Versions 3.0 through 3.5.1 and 3.6.0 through 3.11.1 have stored cross-site scripting vulnerabilities in multiple components of the Prometheus web UI where metric names and label values are injected into innerHTML without escaping. In both the Mantine UI and old React UI, chart tooltips on the Graph page render metric names containing HTML/JavaScript without sanitization. In the old React UI, the Metric Explorer fuzzy search…

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Affected Packages2 packages

▶CVEListV5prometheus/prometheus< 0.311.2-0.20260410083055-07c6232d159b+2
▶Gogithub.com/prometheus_prometheus3.0.0 — 3.5.1+2

🔴Vulnerability Details

3
VulDB
Prometheus up to 3.5.1/3.11.1 label_replace label cross site scripting (GHSA-vffh-x6r8-xx99)↗2026-04-16
▶
CVEList
Prometheus: Stored XSS via metric names and label values in web UI tooltips and metrics explorer↗2026-04-15
▶
GHSA
Prometheus has Stored XSS via metric names and label values in Prometheus web UI tooltips and metrics explorer↗2026-04-13
▶
CVE-2026-40179 — Cross-site Scripting in Prometheus | cvebase