CVE-2026-116802

Medium

Description

DOMPurify before 3.4.17 contains a cross-site scripting vulnerability that allows attackers to bypass the SMIL attributeName=href guard when PARSER_MEDIA_TYPE is application/xhtml+xml, because transformCaseFunc does not lowercase attribute names. Attackers can submit SVG with an animate or set element using attributeName="href" and a javascript: entry in values to execute script when users click the sanitized link.

SeverityMedium

CVSS6.1

Exploit probability—

ProductDompurify

PublishedOct 27, 2026

First seenOct 27, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

dompurify3.4.17 or later

Vendor advisories

github.com/cure53/DOMPurify/security/advisories/GHSA-c6gr-qvv4-5v3f

Affected products

Product	Affected versions	Fixed in
dompurifynpm	v < 3.4.17	3.4.17

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.