Is there a public exploit for CVE-2026-40179?

Yes. Proof-of-concept code for CVE-2026-40179 has been published publicly.

Is there a proof of concept for CVE-2026-40179?

Yes — 1 proof-of-concept entry is linked on this page, from public repositories and community submissions. They are listed for authorised testing only.

How severe is CVE-2026-40179?

CVE-2026-40179 scores CVSS 5.3 (v4.0), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.31%.

What does CVE-2026-40179 affect?

CVE-2026-40179 affects prometheus prometheus.

5.3 Medium

Prometheus is an open-source monitoring system and time series database.

CVE-2026-40179

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 results use dangerouslySetInnerHTML without escaping, and heatmap cell tooltips interpolate le label values without sanitization. With Prometheus v3.x defaulting to UTF-8 metric and label name validation, characters like , and " are now valid in metric names and labels. An attacker who can inject metrics via a compromised scrape target, remote write, or OTLP receiver endpoint can execute arbitrary JavaScript in the browser of any Prometheus user who views the metric in the Graph UI, potentially enabling configuration exfiltration, data deletion, or Prometheus shutdown depending on enabled flags. This issue has been fixed in versions 3.5.2 and 3.11.2. If developers are unable to immediately…

Proof-of-concept code is published

Public PoC

Public PoCbsdrip/CVE-2026-40179-PoC1 stars

Signals come from Exploit-DB, Metasploit, Nuclei and published proof-of-concept repositories. Their absence means nothing was found, not that nothing exists.

Assessment

CVSS: 5.3 (v4.0)
Severity: Medium
EPSS: 0.31% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Public PoC
Published: 15 April 2026
Last updated: 17 June 2026
Affected: prometheus · prometheus
Weakness: CWE-79
Assigner: security-advisories@github.com

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

At the source

References

Community proofs of concept

No community proof of concept yet. If you have one for a published vulnerability and the right to share it, add it below — it will appear here once reviewed.

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