CVE-2026-66010

MEDIUM SEVERITY

CVSS Score & Metrics

Base Score

6.1 / 10

Vector String

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

Vulnerability Description

DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOM_ELEMENT_HANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into innerHTML sinks, creating second-order XSS gadgets.

Vulnerability Details

Published Date

July 24, 2026

Last Modified

July 24, 2026

CWE ID

CWE-79

Source

NVD

Vendor

cure53

Product

DOMPurify

External References

https://github.com/cure53/DOMPurify/security/advisories/GHSA-c2j3-45gr-mqc4
https://www.vulncheck.com/advisories/dompurify-before-hook-bypass-via-custom-element-handling

CVE-2026-66010

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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