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CVE-2025-29771— HtmlSanitizer vulnerable to XSS when used with contentEditable

Quick assessment

Affected
jitbit HtmlSanitizer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mganss HtmlSanitizer是Mganss个人开发者的一个基于C#、AngleSharp用于从清楚源代码中可能导致XSS攻击的HTML代码和文档的软件。 Mganss HtmlSanitizer 2.0.3之前版本存在跨站脚本漏洞，该漏洞源于与contentEditable元素一起使用时存在跨站脚本漏洞。

AI Predicted 6.1 Difficulty: Moderate EPSS 0.39% · P32
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I. Basic Information for CVE-2025-29771

Vulnerability Information
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Vulnerability Title
HtmlSanitizer vulnerable to XSS when used with contentEditable
Source: CVE Program / CVE List V5
Vulnerability Description
HtmlSanitizer is a client-side HTML Sanitizer. Versions prior to 2.0.3 have a cross-site scripting vulnerability when the sanitizer is used with a `contentEditable` element to set the elements `innerHTML` to a sanitized string produced by the package. If the code is particularly crafted to abuse the code beautifier, that runs AFTER sanitation. The issue is patched in version 2.0.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
Vulnerability Title
Mganss HtmlSanitizer 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mganss HtmlSanitizer是Mganss个人开发者的一个基于C#、AngleSharp用于从清楚源代码中可能导致XSS攻击的HTML代码和文档的软件。 Mganss HtmlSanitizer 2.0.3之前版本存在跨站脚本漏洞，该漏洞源于与contentEditable元素一起使用时存在跨站脚本漏洞。
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

Vendor Product Affected Versions CPE Subscribe
jitbit HtmlSanitizer < 2.0.3 -

II. Public POCs for CVE-2025-29771

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III. Intelligence Information for CVE-2025-29771

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Patches & Fixes for CVE-2025-29771 (1)

Vendor Advisories for CVE-2025-29771 (1)

IV. Related Vulnerabilities

Same product: HtmlSanitizer
Same weakness: CWE-79

V. Comments for CVE-2025-29771

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