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I. Basic Information for CVE-2026-33230
Vulnerability Information

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Vulnerability Title
nltk Vulnerable to Cross-site Scripting
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
NLTK 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NLTK是NLTK开源的一个自然语言工具包。用于支持自然语言处理的研究和开发。 NLTK 3.9.3及之前版本存在跨站脚本漏洞,该漏洞源于nltk.app.wordnet_app中lookup_...路由存在反射型跨站脚本,可能导致攻击者注入任意HTML或JavaScript。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
nltknltk <= 3.9.3 -
II. Public POCs for CVE-2026-33230
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III. Intelligence Information for CVE-2026-33230
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IV. Related Vulnerabilities
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