CVE-2026-65900

MEDIUM 6.1

DOMPurify before 3.4.8 Template Expression Injection via RETURN_DOM

CVSS Score

6.1

EPSS Score

0.0%

EPSS Percentile

0th

DOMPurify versions >=3.0.0 and before 3.4.8, when configured with SAFE_FOR_TEMPLATES together with a DOM output mode (RETURN_DOM, RETURN_DOM_FRAGMENT, or IN_PLACE), fail to strip template expressions (e.g. ${evil}, {{evil}}, <%evil%>) inside <template> element content. The final normalization/scrub pass (_scrubTemplateExpressions) uses a NodeIterator and node.normalize() that do not descend into template.content, so expressions that only form after adjacent text nodes merge survive sanitization. This bypasses SAFE_FOR_TEMPLATES and can allow a downstream template engine to evaluate attacker-supplied expressions. The string output path is not affected.

CWE	CWE-79
Vendor	cure53
Product	dompurify
Published	Jul 23, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

cure53 / DOMPurify

3.0.0 < 3.4.8

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/cure53/DOMPurify/security/advisories/GHSA-gvmj-g25r-r7wr vulncheck.com: https://www.vulncheck.com/advisories/dompurify-before-template-expression-injection-via-return-dom

Credits

🔍 IamLeandrooooo