XSS in Cure53 Dompurify
CVE-2026-47423
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Cure53 Dompurify — versions >= 3.4.4, < 3.4.5, 3.4.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/cure53/DOMPurify/security/advisories/GHSA-87xg-pxx2-7hvx (Exploit, Vendor Advisory)
- github.com/cure53/DOMPurify/commit/011b0c78f2a0f57ee54f5fcccb697a46ca6e63ea (Patch)
- github.com/cure53/DOMPurify/releases/tag/3.4.5 (Release Notes)
Frequently asked questions
- What is CVE-2026-47423?
- CVE-2026-47423 is a high-severity vulnerability in Cure53 Dompurify, classified under Cross-site Scripting. CVSS score: 8.2/10. Published 2026-07-14.
- How severe is CVE-2026-47423?
- High severity. CVSS v3 base score is 8.2 out of 10.
- Is CVE-2026-47423 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.