CVE-2026-33403

{
  "id": "CVE-2026-33403",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-06T15:17:10.303",
  "lastModified": "2026-10-26T22:10:00.163",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker blocking application. From 6.0 to before 6.5, a reflected DOM-based XSS vulnerability in taillog.js allows an unauthenticated attacker to inject arbitrary HTML into the Pi-hole admin interface by crafting a malicious URL. The file query parameter is interpolated into an innerHTML assignment without escaping. Because the Content-Security-Policy is missing the form-action directive, injected <form> elements can exfiltrate credentials to an external origin. This vulnerability is fixed in 6.5."
    },
    {
      "lang": "es",
      "value": "La Interfaz de administración de Pi-hole es una interfaz web para gestionar Pi-hole, una aplicación de bloqueo de anuncios y rastreadores de internet a nivel de red. Desde la 6.0 hasta antes de la 6.5, una vulnerabilidad de XSS reflejado basado en DOM en taillog.js permite a un atacante no autenticado inyectar HTML arbitrario en la interfaz de administración de Pi-hole mediante la creación de una URL maliciosa. El parámetro de consulta file se interpola en una asignación de innerHTML sin escape. Debido a que la Content-Security-Policy carece de la directiva form-action, los elementos [form] inyectados pueden exfiltrar credenciales a un origen externo. Esta vulnerabilidad está corregida en la 6.5."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "pi-hole",
          "product": "web",
          "versions": [
            {
              "version": ">= 6.0, < 6.5",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "CHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-06T15:05:19.739883Z",
          "id": "CVE-2026-33403",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:pi-hole:web_interface:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "6.0",
              "versionEndIncluding": "6.4.1",
              "matchCriteriaId": "3F1EA9FF-4B56-41DE-A685-A1B75E6ECEF2"
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  ],
  "references": [
    {
      "url": "https://github.com/pi-hole/web/security/advisories/GHSA-7xqw-r9pr-qv59",
      "source": "[email protected]",
      "tags": [
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/pi-hole/web/security/advisories/GHSA-7xqw-r9pr-qv59",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
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}