In DOMPurify through 3.3.3, function predicates supplied via ADD_ATTR or ADD_TAGS to DOMPurify.sanitize() persist in internal state (EXTRA_ELEMENT_HANDLING) across subsequent sanitize() calls on the same instance. If a later call on the same instance provides ADD_ATTR or ADD_TAGS as an array rather than a function, the previously set function handler is neither cleared nor overwritten, so it continues to approve attacker-controlled attributes or tags. This can allow dangerous event-handler attributes or forbidden tags (bypassing FORBID_TAGS) to survive sanitization, resulting in cross-site scripting. The vendor (Cure53) considers this an edge case outside DOMPurify's threat model; the referenced advisory lists 3.4.0 as the patched version.
References
| Link | Resource |
|---|---|
| https://github.com/cure53/DOMPurify/security/advisories/GHSA-9p3w-6h5p-cv75 | Exploit Third Party Advisory |
| https://www.vulncheck.com/advisories/dompurify-before-xss-via-add-attr-add-tags-state-leakage | Third Party Advisory |
Configurations
History
28 Jul 2026, 15:50
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:* | |
| First Time |
Cure53 dompurify
Cure53 |
|
| References | () https://github.com/cure53/DOMPurify/security/advisories/GHSA-9p3w-6h5p-cv75 - Exploit, Third Party Advisory | |
| References | () https://www.vulncheck.com/advisories/dompurify-before-xss-via-add-attr-add-tags-state-leakage - Third Party Advisory |
23 Jul 2026, 14:18
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-07-23 14:18
Updated : 2026-07-28 15:50
NVD link : CVE-2026-65911
Mitre link : CVE-2026-65911
CVE.ORG link : CVE-2026-65911
JSON object : View
Products Affected
cure53
- dompurify
CWE
CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')