CVE-2026-47423

DOMPurify XSS via `selectedcontent` re-clone

CVSS 8.2 HIGHEPSS 0.3%CWE-79

Vexday Risk Score

41Attention

SSVC decision (CISA)

Attend

PoC available → attend closely

Exploit maturity

Proof of concept

Public proof of concept exists, but not yet automated.

CVSS 8.2EPSS 0.3%KEV nãoPoC públicaNuclei —Metasploit —Patch —

Lifecycle

03 Jun 2026Public PoC

14 Jul 2026Published on NVD

Recommendation: Plan a near-term fix — a public PoC already exists.

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. In 3.4.4, DOMPurify allowed selectedcontent by default, allowing browsers to re-clone an XSS payload after sanitization so that unsanitized markup inside <selectedcontent> is returned. This issue is fixed in version 3.4.5.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Affected products

cure53 · DOMPurify

public PoCs found — 1

githubgithub.com/Galaxy-sc/CVE-2026-47423-dompurify-xss-detector★ 0

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

References

https://github.com/cure53/DOMPurify/commit/011b0c78f2a0f57ee54f5fcccb697a46ca6e63ea https://github.com/cure53/DOMPurify/releases/tag/3.4.5 https://github.com/cure53/DOMPurify/security/advisories/GHSA-87xg-pxx2-7hvx