CVE-2026-66010

Summary

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.

Affected Software

Weaknesses

• CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/cure53/DOMPurify/security/advisories/GHSA-c2j3-45gr-mqc4

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

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