sanitize-html is vulnerable to XSS through incomprehensive sanitization
Date: 2025-09
Affected: npm/sanitize-html
Attack vector: xss
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2019-25225
CWE: CWE-79
CVSS: 6.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)

`sanitize-html` prior to version 2.0.0-beta is vulnerable to Cross-site Scripting (XSS). The `sanitizeHtml()` function in `index.js` does not sanitize content when using the custom `transformTags` option, which is intended to convert attribute values into text. As a result, malicious input can be transformed into executable code.


Mitigations:

Architectural layers (MAESTRO):