Template injection via untraversed template content
Published Jul 23, 2026 · Updated Jul 23, 2026
Template injection in Cure53 DOMPurify 3.0.0 through 3.4.7 allows attackers to preserve expressions in sanitized DOM output. The _scrubTemplateExpressions pass uses a NodeIterator and node.normalize(), neither of which descends into template.content, so expressions assembled from adjacent text nodes remain. Exploitation requires non-default SAFE_FOR_TEMPLATES plus a DOM output mode and a downstream template engine that evaluates the expression, enabling client-side script execution or server-side code execution.
Summary
What happened
Template injection in Cure53 DOMPurify 3.0.0 through 3.4.7 allows attackers to preserve expressions in sanitized DOM output. The _scrubTemplateExpressions pass uses a NodeIterator and node.normalize(), neither of which descends into template.content, so expressions assembled from adjacent text nodes remain. Exploitation requires non-default SAFE_FOR_TEMPLATES plus a DOM output mode and a downstream template engine that evaluates the expression, enabling client-side script execution or server-side code execution.
The record
- CVE
- CVE-2026-65900
- Published
- Jul 23, 2026
- Updated
- Jul 23, 2026
- Vendor
- Cure53
- Product
- DOMPurify
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 23, 2026CVE publishedPublication date reported by the CVE source.
- Jul 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=3.0.0 <3.4.8
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- SAFE_FOR_TEMPLATES template-content bypass proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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