CVE-2026-116802

Versions of DOMPurify prior to 3.4.17 are vulnerable to a Cross-Site Scripting (XSS) vulnerability. The root cause is that transformCaseFunc fails to lowercase attribute names, allowing attackers to bypass the SMIL attributeName=href guard when PARSER_MEDIA_TYPE is set to application/xhtml+xml. E...

CVE-2026-116802 DOMPurify before 3.4.17 XSS via SMIL attributeName Guard Bypass in XHTML Mode

DOMPurify before 3.4.17 contains a cross-site scripting vulnerability that allows attackers to bypass the SMIL attributeName=href guard when PARSERMEDIATYPE is application/xhtml+xml, because transformCaseFunc does not lowercase attribute names. Attackers can submit SVG with an animate or set...