6.1

CVE-2026-44903: prometheus Cross-site Scripting

CVSS: 6.1v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-44903DEBIAN-CVE-2026-44903CGA-22qp-mvx5-pcjr
Published 26-05-2026Last modified 27-05-2026
Open JSON

Vulnerability summary

CVE-2026-44903 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in prometheus. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.4% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (NVD)
EPSS score
0.24%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 2
OPENSUSE-SU-2026:21483-1CGA-8Q9G-VV4M-6VJF

Timeline

  1. 26-05-2026
    PublishedVulnerability first disclosed.
  2. 27-05-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

10 scores · 7 sources · 2 versions

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

+0.04 pp

From 0.20% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.24%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard200 products
  • agentbeat< 9.2.7-r8
  • agentbeat-fips< 9.2.7-r9
  • amazon-cloudwatch-agentAll versions (No fix recorded)
  • amazon-cloudwatch-agent-fipsAll versions (No fix recorded)
  • amazon-cloudwatch-agent-operator< 3.5.0-r0

1 vendor · 200 products · Showing 200 of 336. Use Open JSON for the complete list.

References

8 links