CVE-2026-47423: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in cure53 DOMPurify
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.
AI Analysis
Technical Summary
CVE-2026-47423 is a high-severity cross-site scripting vulnerability in DOMPurify 3.4.4, a DOM-only sanitizer for HTML, MathML, and SVG. The vulnerability arises because the sanitizer allowed the <selectedcontent> element by default, permitting browsers to re-clone an XSS payload after sanitization. This results in unsanitized markup being returned inside the <selectedcontent> element, potentially enabling script injection. The issue is resolved in DOMPurify version 3.4.5.
Potential Impact
Successful exploitation can lead to partial compromise of confidentiality by allowing script injection via unsanitized markup inside the <selectedcontent> element. The vulnerability has a CVSS 3.1 score of 8.2 (high), indicating it is exploitable remotely without privileges and requires user interaction. The impact includes high confidentiality loss and low integrity impact, with no availability impact.
Mitigation Recommendations
Upgrade DOMPurify to version 3.4.5 or later where this vulnerability is fixed. Since this is a library vulnerability, applying the official fix by updating the dependency is the recommended remediation. No other vendor advisory or temporary fixes are provided.
CVE-2026-47423: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in cure53 DOMPurify
Description
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 v3.1
Score 8.2high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-47423 is a high-severity cross-site scripting vulnerability in DOMPurify 3.4.4, a DOM-only sanitizer for HTML, MathML, and SVG. The vulnerability arises because the sanitizer allowed the <selectedcontent> element by default, permitting browsers to re-clone an XSS payload after sanitization. This results in unsanitized markup being returned inside the <selectedcontent> element, potentially enabling script injection. The issue is resolved in DOMPurify version 3.4.5.
Potential Impact
Successful exploitation can lead to partial compromise of confidentiality by allowing script injection via unsanitized markup inside the <selectedcontent> element. The vulnerability has a CVSS 3.1 score of 8.2 (high), indicating it is exploitable remotely without privileges and requires user interaction. The impact includes high confidentiality loss and low integrity impact, with no availability impact.
Mitigation Recommendations
Upgrade DOMPurify to version 3.4.5 or later where this vulnerability is fixed. Since this is a library vulnerability, applying the official fix by updating the dependency is the recommended remediation. No other vendor advisory or temporary fixes are provided.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-19T19:37:43.526Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a56962468715ace431dc68f
Added to database: 07/14/2026, 20:03:48 UTC
Last enriched: 07/22/2026, 00:55:20 UTC
Last updated: 08/26/2026, 22:52:11 UTC
Views: 69
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