CVE-2026-49459

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

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.

Scores

Weaknesses (CWE)

• CWE-79
• CWE-693
• CWE-1321

Advisories

• GHSA-r47g-fvhr-h676 — DOMPurify: IN_PLACE mode preserves attributes of a clobbered root element, allowing XSS via attacker-controlled root DOM

European references

• ENISA EUVD · EUVD-2026-44450
• GCVE · GCVE-0-2026-49459

CERT-FR advisories

• CERTFR-2026-AVI-1291 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-1256 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-1165 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-1094 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-1049 — Multiples vulnérabilités dans Oracle MySQL · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

• cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:* < 3.4.6

Affected products

References

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

Sources