Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD 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.
Priority
LOW
Exploitation
NONE
PoC
YES
Patch
NONE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
CVE-2026-66010 DOMPurify Before 3.4.12 Attribute Bypass in Custom Elements Allows Second-Order XSS https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-66010
Post summary
This entry reports the disclosure of an attribute bypass in DOMPurify (versions before 3.4.ылара) that permits second‑order XSS in custom elements, with no PoC, exploit, active exploitation, or patch information provided.
1 of 1 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | cure53 | dompurify | - | - | - |