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DOMPurify Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) Vulnerability - CVE-2026-41240 - Vulnerability Database
DOMPurify

DOMPurify Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) Vulnerability - CVE-2026-41240

Medium
Reference: CVE-2026-41240
NVD Link: https://nvd.nist.gov/vuln/detail/CVE-2026-41240
Title: DOMPurify Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) Vulnerability
Overview:

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML MathML and SVG. Versions prior to 3.4.0 have an inconsistency between FORBID_TAGS and FORBID_ATTR handling when function-based ADD_TAGS is used. Commit c361baa added an early exit for FORBID_ATTR at line 1214. The same fix was not applied to FORBID_TAGS. At line 1118-1123 when EXTRA_ELEMENT_HANDLING.tagCheck returns true the short-circuit evaluation skips the FORBID_TAGS check entirely. This allows forbidden elements to survive sanitization with their attributes intact. Version 3.4.0 patches the issue.