CVE-2026-65912 | DOMPurify before 3.3.2 contains a URI validation bypass vuln… | CVSS 6.1 MEDIUM

Description

DOMPurify before 3.3.2 contains a URI validation bypass vulnerability when ADD_ATTR is provided as a predicate function via EXTRA_ELEMENT_HANDLING.attributeCheck. Attackers can supply a predicate that accepts specific attribute and tag combinations to bypass URI-safe validation, allowing unsafe protocols like javascript: to survive sanitization and execute as DOM-based XSS when the link is activated.

Metadata

CVE ID: CVE-2026-65912
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-23 12:51 UTC
Published: 2026-07-23 13:16 UTC
Last updated: 2026-07-23 13:16 UTC
Primary CWE: CWE-79
Improper Neutralization of Input During Web Page Generation …
Vendor / Product: cure53 / DOMPurify
Sources: cve.org · NVD

Severity & Metrics

6.1 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products (1)

Vendor	Product	Platform	Versions
cure53	DOMPurify	—	0 < 3.3.2, 3.3.2

Weakness (CWE)

CWE	Source	Description
CWE-79	cna	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS scores (2)

Score	Severity	Version	Source	Vector
6.1	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.1	MEDIUM	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

References (2)

GitHub Security Advisory (GHSA-cjmm-f4jc-qw8r) https://github.com/cure53/DOMPurify/security/advisories/GHSA-cjmm-f4jc-qw8r
VulnCheck Advisory: DOMPurify before 3.3.2 URI Validation Bypass via ADD_ATTR https://www.vulncheck.com/advisories/dompurify-before-uri-validation-bypass-via-add-attr