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CVE-2026-40179

🗓️ 15 Apr 2026 22:26:46Reported by GitHub_MType 
cve
 cve
🔗 web.nvd.nist.gov👁 287 Views🌐 WEB

Prometheus web UI stored XSS via metric names and label values; fixed in 3.5.2 and 3.11.2.

Related
Detection
Affected
Refs
Paths
NVD
Vulners
Node
OR
prometheusprometheusRange3.0.0–3.5.2
prometheusprometheusRange3.6.0–3.11.2
[
  {
    "vendor": "prometheus",
    "product": "prometheus",
    "versions": [
      {
        "version": ">= 3.0.0, < 3.5.2",
        "status": "affected"
      },
      {
        "version": ">= 3.6.0, < 3.11.2",
        "status": "affected"
      },
      {
        "version": "< 0.311.2-0.20260410083055-07c6232d159b",
        "status": "affected"
      }
    ]
  }
]
ParameterPositionPathDescriptionCWE
WriteRequestrequest body/api/v1/writeUnauthenticated remote write endpoint where an attacker can inject metrics with malicious names and labels containing HTML/JavaScript, leading to stored XSS in the Prometheus web UI.CWE-79
match[]query param/api/v1/admin/tsdb/delete_seriesAdmin API endpoint used to delete series; while not the primary XSS vector, it is mentioned as a management interface for the TSDB.CWE-79

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17 Jun 2026 10:44Current
6.8Medium risk
Vulners AI Score6.8
CVSS 3.16.1
CVSS 45.3
EPSS0.00323
SSVC
287