CVE-2026-47423: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in cure53 DOMPurify
DOMPurify version 3.4.4 contains a cross-site scripting (XSS) vulnerability due to allowing <selectedcontent> elements by default, which enables browsers to re-clone an XSS payload after sanitization, returning unsanitized markup. This issue is fixed in version 3.4.5.
AI Analysis
Technical Summary
DOMPurify, a sanitizer for HTML, MathML, and SVG to prevent XSS, in version 3.4.4 allowed the <selectedcontent> element by default. This behavior permitted browsers to re-clone an XSS payload after sanitization, resulting in unsanitized markup being returned inside <selectedcontent>. This vulnerability is identified as CWE-79 (Improper Neutralization of Input During Web Page Generation). The issue is resolved in DOMPurify version 3.4.5.
Potential Impact
An attacker can exploit this vulnerability to execute cross-site scripting attacks by injecting malicious scripts that bypass DOMPurify's sanitization in version 3.4.4. This can lead to high confidentiality impact by exposing sensitive information. Integrity impact is low, and availability is not affected. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade DOMPurify to version 3.4.5 or later, where this vulnerability is fixed. Since the vendor advisory confirms the fix in 3.4.5, applying this official update is the recommended remediation.
CVE-2026-47423: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in cure53 DOMPurify
Description
DOMPurify version 3.4.4 contains a cross-site scripting (XSS) vulnerability due to allowing <selectedcontent> elements by default, which enables browsers to re-clone an XSS payload after sanitization, returning unsanitized markup. 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
DOMPurify, a sanitizer for HTML, MathML, and SVG to prevent XSS, in version 3.4.4 allowed the <selectedcontent> element by default. This behavior permitted browsers to re-clone an XSS payload after sanitization, resulting in unsanitized markup being returned inside <selectedcontent>. This vulnerability is identified as CWE-79 (Improper Neutralization of Input During Web Page Generation). The issue is resolved in DOMPurify version 3.4.5.
Potential Impact
An attacker can exploit this vulnerability to execute cross-site scripting attacks by injecting malicious scripts that bypass DOMPurify's sanitization in version 3.4.4. This can lead to high confidentiality impact by exposing sensitive information. Integrity impact is low, and availability is not affected. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade DOMPurify to version 3.4.5 or later, where this vulnerability is fixed. Since the vendor advisory confirms the fix in 3.4.5, applying this official update is the recommended remediation.
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: 07/14/2026, 22:32:38 UTC
Last updated: 07/14/2026, 23:47:20 UTC
Views: 3
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