CVE-2026-49458

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(node, { IN_PLACE: true }) accepted same-origin foreign-realm DOM nodes while follow-on checks used parent-realm constructors, causing instanceof checks for forms, named node maps, document fragments, and elements to fail and skip clobber, template-content, and shadow-DOM sanitization branches so executable markup could survive. This issue is fixed in version 3.4.6.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/cure53/DOMPurify/commit/bb7739e5bccec7e1ab3dae3f3e42d02db3acaaae	Patch
https://github.com/cure53/DOMPurify/releases/tag/3.4.6	Release Notes
https://github.com/cure53/DOMPurify/security/advisories/GHSA-hpcv-96wg-7vj8	Exploit Mitigation Vendor Advisory
https://github.com/cure53/DOMPurify/security/advisories/GHSA-hpcv-96wg-7vj8	Exploit Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-14 21:17

Updated : 2026-07-21 19:47

NVD link : CVE-2026-49458

Mitre link : CVE-2026-49458

CVE.ORG link : CVE-2026-49458

JSON object : View

Products Affected

cure53

dompurify

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-501

Trust Boundary Violation

CWE-693

Protection Mechanism Failure

{"id": "CVE-2026-49458", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49458", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-15T13:02:56.040047Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "cure53", "product": "DOMPurify", "versions": [{"status": "affected", "version": "< 3.4.6"}]}]}], "published": "2026-07-14T21:17:01.620", "references": [{"url": "https://github.com/cure53/DOMPurify/commit/bb7739e5bccec7e1ab3dae3f3e42d02db3acaaae", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/cure53/DOMPurify/releases/tag/3.4.6", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-hpcv-96wg-7vj8", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-hpcv-96wg-7vj8", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-79"}, {"lang": "en", "value": "CWE-501"}, {"lang": "en", "value": "CWE-693"}]}], "descriptions": [{"lang": "en", "value": "DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(node, { IN_PLACE: true }) accepted same-origin foreign-realm DOM nodes while follow-on checks used parent-realm constructors, causing instanceof checks for forms, named node maps, document fragments, and elements to fail and skip clobber, template-content, and shadow-DOM sanitization branches so executable markup could survive. This issue is fixed in version 3.4.6."}], "lastModified": "2026-07-21T19:47:48.413", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C892F380-B048-4862-B6D1-AC34B0B4D141", "versionEndExcluding": "3.4.6"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}