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.
CVSS 6.1EPSS 0.165%Risk 0.62
View source- Published
- 2026-07-24 13:18:28
- Affected versions
- <3.4.12
- Type
- Library
- Last modified
- 2026-08-06 00:47:37
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N