CVE-2026-84219

Status: DeferredHigh (7.5)—

The Kirki WordPress plugin before 6.3.0 does not hold back every spelling of the HTML entities it decodes when rendering, allowing unauthenticated users to store JavaScript in a comment which then runs in the session of anyone viewing a page that displays it, including an administrator, and on every page of the site when its header or footer is built to show comments.

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Base score: 7.5

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.37%
Percentile among all scored CVEs: 29
Score date: 10/6/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1189 Drive-by Compromiseinitial access95 %
Primary impactT1059.007 JavaScriptexecution90 %
Secondary impactT1078 Valid Accountsstealth · persistence · privilege escalation · initial access75 %

XSS almacenado en comentarios sin validación (CWE-79) ejecutable por usuarios no autenticados. UI:R + almacenamiento persistente = T1189. Impacto: JavaScript ejecutado en sesiones de administradores y en páginas del sitio, permitiendo robo de credenciales o sesiones.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

User Training Restrict Web-Based Content Application Developer Guidance Active Directory Configuration User Account Management Privileged Account Management

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Kirki — Kirki^AI

CWEs

CWE-79

References

https://wpscan.com/vulnerability/e95bd1e3-6f61-423f-add6-519e1ca7bf66/

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-84219",
  "cveTags": [],
  "metrics": {
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      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-84219",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-06T10:39:34.126552Z"
        }
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          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 1.6
      }
    ]
  },
  "affected": [
    {
      "source": "contact@wpscan.com",
      "affectedData": [
        {
          "vendor": "Unknown",
          "product": "Kirki",
          "versions": [
            {
              "status": "affected",
              "version": "6.2.1",
              "lessThan": "6.3.0",
              "versionType": "semver"
            }
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  ],
  "published": "2026-09-06T07:16:43.427",
  "references": [
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      "url": "https://wpscan.com/vulnerability/e95bd1e3-6f61-423f-add6-519e1ca7bf66/",
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      "value": "The Kirki  WordPress plugin before 6.3.0 does not hold back every spelling of the HTML entities it decodes when rendering, allowing unauthenticated users to store JavaScript in a comment which then runs in the session of anyone viewing a page that displays it, including an administrator, and on every page of the site when its header or footer is built to show comments."
    }
  ],
  "lastModified": "2026-09-08T19:09:21.310",
  "sourceIdentifier": "contact@wpscan.com"
}