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CVE-2026-28348

Estado: AnalizadaMedia (6.1)—

lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the _has_sneaky_javascript() method strips backslashes before checking for dangerous CSS keywords. This causes CSS Unicode escape sequences to bypass the @import and expression() filters, allowing external CSS loading or XSS in older browsers. This issue has been patched in version 0.4.4.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Fedoralovespython — Lxml Html Clean

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-28348",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-28348",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-03-06T17:55:33.114241Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "fedora-python",
          "product": "lxml_html_clean",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.4.4"
            }
          ]
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      ]
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  ],
  "published": "2026-03-05T20:16:16.180",
  "references": [
    {
      "url": "https://github.com/fedora-python/lxml_html_clean/commit/2ef732667ddbc74ea59847bcf24b75809aaeed3b",
      "tags": [
        "Patch"
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      "url": "https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-hw26-mmpg-fqfg",
      "tags": [
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        "Vendor Advisory"
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-116"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the _has_sneaky_javascript() method strips backslashes before checking for dangerous CSS keywords. This causes CSS Unicode escape sequences to bypass the @import and expression() filters, allowing external CSS loading or XSS in older browsers. This issue has been patched in version 0.4.4."
    },
    {
      "lang": "es",
      "value": "lxml_html_clean es un proyecto para funcionalidades de limpieza de HTML copiado de 'lxml.html.clean'. Antes de la versión 0.4.4, el método _has_sneaky_javascript() elimina las barras invertidas antes de verificar palabras clave CSS peligrosas. Esto provoca que las secuencias de escape Unicode de CSS omitan los filtros @import y expression(), permitiendo la carga externa de CSS o XSS en navegadores antiguos. Este problema ha sido parcheado en la versión 0.4.4."
    }
  ],
  "lastModified": "2026-06-17T10:28:27.647",
  "configurations": [
    {
      "nodes": [
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          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
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              "versionEndExcluding": "0.4.4"
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          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}