What is GHSA-jxrp-r7gx-q4j8?

GHSA-jxrp-r7gx-q4j8 is a security advisory published by GitHub Security Advisories with Medium severity. DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed...

Which CVE IDs does GHSA-jxrp-r7gx-q4j8 cover?

GHSA-jxrp-r7gx-q4j8 covers the following CVE IDs: CVE-2026-66010. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-jxrp-r7gx-q4j8?

GHSA-jxrp-r7gx-q4j8 has a CVSS v3 base score of 6.1, published by GitHub Security Advisories.

GHSA-jxrp-r7gx-q4j8MediumCVSS 6.1

DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed...

Vendor

GitHub Security Advisories

Published

July 24, 2026

Last Modified

July 24, 2026

🔗 CVE IDs covered (1)

CVE-2026-66010 →

📋 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.

🔗 References (4)

https://github.com/cure53/DOMPurify/security/advisories/GHSA-c2j3-45gr-mqc4
https://nvd.nist.gov/vuln/detail/CVE-2026-66010
https://www.vulncheck.com/advisories/dompurify-before-hook-bypass-via-custom-element-handling
https://github.com/advisories/GHSA-jxrp-r7gx-q4j8