CVE-2025-66469

{
  "id": "CVE-2025-66469",
  "sourceIdentifier": "[email protected]",
  "published": "2025-12-09T00:15:49.330",
  "lastModified": "2026-10-19T19:10:00.130",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "NiceGUI is a Python-based UI framework. Versions 3.3.1 and below are vulnerable to Reflected XSS through its ui.add_css, ui.add_scss, and ui.add_sass functions. The functions lack proper sanitization or encoding for the JavaScript context they generate. An attacker can break out of the intended <style> or <script> tags by injecting closing tags (e.g., </style> or </script>), allowing for the execution of arbitrary JavaScript. This issue is fixed in version 3.4.0."
    },
    {
      "lang": "es",
      "value": "NiceGUI es un framework de interfaz de usuario (UI) basado en Python. Las versiones 3.3.1 e inferiores son vulnerables a XSS Reflejado a través de sus funciones ui.add_css, ui.add_scss y ui.add_sass. Las funciones carecen de una sanitización o codificación adecuada para el contexto de JavaScript que generan. Un atacante puede escapar de las etiquetas <style> o [script_tag] previstas inyectando etiquetas de cierre (por ejemplo, </style> o </script>), lo que permite la ejecución de JavaScript arbitrario. Este problema se ha solucionado en la versión 3.4.0."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "zauberzeug",
          "product": "nicegui",
          "versions": [
            {
              "version": "< 3.4.0",
              "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": "2025-12-09T14:18:04.262651Z",
          "id": "CVE-2025-66469",
          "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:zauberzeug:nicegui:*:*:*:*:*:*:*:*",
              "versionEndExcluding": "3.4.0",
              "matchCriteriaId": "AD5CC19F-9BBA-4C0D-879C-627478C1E72B"
            }
          ]
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  ],
  "references": [
    {
      "url": "https://github.com/zauberzeug/nicegui/commit/a8fd25b7d5e23afb1952d0f60a1940e18b5f1ca8",
      "source": "[email protected]",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-72qc-wxch-74mg",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-72qc-wxch-74mg",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    }
  ]
}