CVE-2026-66010EPSS p21.1%

CVE-2026-66010CVE-2026-66010

cure53 / dompurify

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.

Scoring

CVSS 6.1 ()
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS0.30% probability of exploitation · percentile 21.1% · 2026-10-05T12:00:23Z
Last modified2026-08-06
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.