Is there a public exploit for CVE-2026-44903?

No public exploit for CVE-2026-44903 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-44903?

CVE-2026-44903 scores CVSS 5.1 (v4.0), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.2%.

What does CVE-2026-44903 affect?

CVE-2026-44903 affects prometheus prometheus.

5.1 Medium

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

CVE-2026-44903

Prometheus is an open-source monitoring system and time series database. From 2.49.0 to before 3.5.3 and 3.11.3, in the Prometheus server's legacy web UI (enabled via the command-line flag --enable-feature=old-ui), the histogram heatmap chart view does not escape le label values when inserting them into the HTML for use as axis tick mark labels. An attacker who can inject crafted metrics can execute JavaScript in the browser of any Prometheus user who views the metric in the heatmap chart UI. This vulnerability is fixed in 3.5.3 and 3.11.3.

Assessment

CVSS: 5.1 (v4.0)
Severity: Medium
EPSS: 0.2% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 26 May 2026
Last updated: 24 July 2026
Affected: prometheus · prometheus
Weakness: CWE-79
Assigner: security-advisories@github.com

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

At the source

References

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