FKIE_CVE-2026-33230

Vulnerability from fkie_nvd - Published: 2026-03-20 23:16 - Updated: 2026-03-23 19:14
Severity ?
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Summary
NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, `nltk.app.wordnet_app` contains a reflected cross-site scripting issue in the `lookup_...` route. A crafted `lookup_<payload>` URL can inject arbitrary HTML/JavaScript into the response page because attacker-controlled `word` data is reflected into HTML without escaping. This impacts users running the local WordNet Browser server and can lead to script execution in the browser origin of that application. Commit 1c3f799607eeb088cab2491dcf806ae83c29ad8f fixes the issue.
References
security-advisories@github.comhttps://github.com/nltk/nltk/commit/1c3f799607eeb088cab2491dcf806ae83c29ad8fPatch
security-advisories@github.comhttps://github.com/nltk/nltk/commit/40d0bc1d484a3458d6a63ecb5ba4957ab16ba14ePatch
security-advisories@github.comhttps://github.com/nltk/nltk/security/advisories/GHSA-gfwx-w7gr-fvh7Exploit, Vendor Advisory
Impacted products
Vendor Product Version
nltk nltk *
To clipboard 

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  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E3C35863-7D82-4EEF-BDE8-E94C559CF4FB",
              "versionEndIncluding": "3.9.3",
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            }
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          "operator": "OR"
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, `nltk.app.wordnet_app` contains a reflected cross-site scripting issue in the `lookup_...` route. A crafted `lookup_\u003cpayload\u003e` URL can inject arbitrary HTML/JavaScript into the response page because attacker-controlled `word` data is reflected into HTML without escaping. This impacts users running the local WordNet Browser server and can lead to script execution in the browser origin of that application. Commit 1c3f799607eeb088cab2491dcf806ae83c29ad8f fixes the issue."
    },
    {
      "lang": "es",
      "value": "NLTK (Natural Language Toolkit) es un conjunto de m\u00f3dulos Python de c\u00f3digo abierto, conjuntos de datos y tutoriales que apoyan la investigaci\u00f3n y el desarrollo en Procesamiento del Lenguaje Natural. En las versiones 3.9.3 y anteriores, `nltk.app.wordnet_app` contiene una vulnerabilidad de cross-site scripting reflejado en la ruta \u0027lookup_...\u0027. Una URL \u0027lookup_\u0027 manipulada puede inyectar HTML/JavaScript arbitrario en la p\u00e1gina de respuesta porque los datos \u0027word\u0027 controlados por el atacante se reflejan en HTML sin escapar. Esto afecta a los usuarios que ejecutan el servidor local de WordNet Browser y puede conducir a la ejecuci\u00f3n de scripts en el origen del navegador de esa aplicaci\u00f3n. El commit 1c3f799607eeb088cab2491dcf806ae83c29ad8f corrige la vulnerabilidad."
    }
  ],
  "id": "CVE-2026-33230",
  "lastModified": "2026-03-23T19:14:50.023",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
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  },
  "published": "2026-03-20T23:16:46.680",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
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      "url": "https://github.com/nltk/nltk/commit/1c3f799607eeb088cab2491dcf806ae83c29ad8f"
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      "source": "security-advisories@github.com",
      "tags": [
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      "url": "https://github.com/nltk/nltk/commit/40d0bc1d484a3458d6a63ecb5ba4957ab16ba14e"
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      "tags": [
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-79"
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      "source": "security-advisories@github.com",
      "type": "Primary"
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  ]
}


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