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Fencer Vulns
medium 6.1

CVE-2026-44903 json

Prometheus: Stored XSS via crafted histogram bucket label values in the heatmap display of the old Prometheus web UI

published 2026-05-05 6 mo ago modified 2026-09-10 1 mo ago also BIT-prometheus-2026-44903 , EUVD-2026-32008 , GHSA-fw8g-cg8f-9j28 , GO-2026-5381

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/prometheus/prometheus 0.311.3
  • bitnami prometheus 0.305.3, 0.311.3, 3.5.3, 3.11.3
  • prometheus prometheus 0.305.3, 0.311.3, 3.5.3, 3.11.3
  • prometheus Debian 14 3.5.3+ds1-1

debian advisories DEBIAN-CVE-2026-44903

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 5.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
GitHub 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA 4.0 5.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
go github.com/prometheus/prometheus
<0.311.3
0.311.3
bitnami prometheus
<0.305.3
>=0.306.0, <0.311.3
>=2.49.0, <3.5.3
>=3.6.0, <3.11.3
0.305.3
0.311.3
3.5.3
3.11.3

Affected products

  • prometheus prometheus

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Support weird prometheus go-module version nonsense.