What’s Vulnerable › Vulnerabilities

CVE-2026-49459: DOMPurify: IN_PLACE mode preserves attributes of a clobbered root element, allowing XSS via attacker-controlled root DOM

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-14 · updated 2026-10-24
• Weakness: CWE-79

Description

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(root, { IN_PLACE: true }) could preserve event-handler attributes on an attacker-controlled <form> root when a descendant name clobbered properties checked by _isClobbered, because _forceRemove no-opped on the parent-less root and _sanitizeAttributes returned early. This issue is fixed in version 3.4.6.

Affected products

• cure53 DOMPurify: before 3.4.6 — fixed in 3.4.6

How to fix

Upgrade to a fixed version: cure53 DOMPurify 3.4.6. Check the vendor advisory for mitigations.

References

• https://github.com/cure53/DOMPurify/commit/bb7739e5bccec7e1ab3dae3f3e42d02db3acaaae
• https://github.com/cure53/DOMPurify/releases/tag/3.4.6
• https://github.com/cure53/DOMPurify/security/advisories/GHSA-r47g-fvhr-h676
• https://github.com/cure53/DOMPurify/security/advisories/GHSA-r47g-fvhr-h676

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