CVE-2026-44903

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 92% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.1
EG Score
6.1(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

May 26, 2026

Last Modified

July 24, 2026

Advisory Details (2)

Auto-updated Jun 13, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Stored XSS via crafted histogram bucket label values in the heatmap display of the old Prometheus web UI · Advisory · prometheus/prometheus · GitHub

Affected: v2.7.2

https://github.com/prometheus/prometheus/security/advisories/GHSA-fw8g-cg8f-9j28
github_commit

commit 38f23b9075ce (prometheus/prometheus)

Fix landed in prometheus/prometheus commit 38f23b9075ce — awaiting tagged release

https://github.com/prometheus/prometheus/commit/38f23b9075ced1de2b82d2dad8b2bebb1ecd5b7d

Vendor Advisories for CVE-2026-44903(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 3 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
prometheus2.53.3+ds1-2 ... 3.5.3+ds1-3 (10 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
prometheus2.53.3+ds1-2 ... 2.53.5+ds1-5 (7 versions)3.5.3+ds1-1—
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/prometheus/prometheus—0.311.3—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 111 total refreshes for this CVE.

  1. 2026-08-15 01:30 UTCEPSS rescore
  2. 2026-08-14 11:53 UTCEG score recompute
  3. 2026-08-13 22:00 UTCEPSS rescore
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  1. 2026-07-30 01:30 UTCEPSS rescore
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  67. 2026-06-06 07:34 UTCEG score recompute▲ 1.00
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  73. 2026-06-02 20:13 UTCEPSS rescore
  74. 2026-06-01 13:52 UTCEPSS rescore
  75. 2026-06-01 13:52 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-44903?
CVE-2026-44903 is a medium vulnerability published on May 26, 2026. 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…
When was CVE-2026-44903 disclosed?
CVE-2026-44903 was first published in the National Vulnerability Database on May 26, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44903 actively exploited?
CVE-2026-44903 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 92.0% of all scored CVEs.
What is the CVSS score of CVE-2026-44903?
CVE-2026-44903 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-44903?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44903, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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