{"cve":"CVE-2026-44903","nvd":{"published":"2026-05-26T22:16:43.010","modified":"2026-07-24T12:10:00.210","status":"Analyzed","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_v4":{"vector":"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","score":5.1},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"references":["https://github.com/prometheus/prometheus/commit/38f23b9075ced1de2b82d2dad8b2bebb1ecd5b7d","https://github.com/prometheus/prometheus/security/advisories/GHSA-fw8g-cg8f-9j28"],"products":["prometheus:prometheus"],"source":"nvd","synced_at":"2026-10-19T22:36:28.938604137+00:00"},"epss":{"cve":"CVE-2026-44903","score":0.00204,"percentile":0.10419,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-fw8g-cg8f-9j28","url":"https://osv.dev/vulnerability/GHSA-fw8g-cg8f-9j28","summary":"Prometheus vulnerable to stored XSS via crafted histogram bucket label values in the old web UI heatmap display","modified":"2026-09-10T03:51:05.550181165Z","packages":[{"ecosystem":"Go","name":"github.com/prometheus/prometheus","purl":"pkg:golang/github.com/prometheus/prometheus","ranges":["<0.311.3"],"fixed":["0.311.3"]}]},{"id":"GO-2026-5381","url":"https://osv.dev/vulnerability/GO-2026-5381","summary":"Prometheus vulnerable to stored XSS via crafted histogram bucket label values in the old web UI heatmap display in github.com/prometheus/prometheus","modified":"2026-06-27T18:29:24.485347528Z","packages":[{"ecosystem":"Go","name":"github.com/prometheus/prometheus","purl":"pkg:golang/github.com/prometheus/prometheus","ranges":["<0.311.3"],"fixed":["0.311.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}