CVE-2026-49978
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.7, DOMPurify IN_PLACE sanitization could skip shadow contents attached to an element inside <template>.content, allowing attacker-controlled markup such as event handlers, JavaScript URLs, or scripts to survive and execute when an application cloned and inserted the sanitized template. This issue is fixed in version 3.4.7.
- Published Jul 14, 2026
- CVSS 6.3 medium
- 0.4% chance of exploitation in the next 30 days (EPSS)
- Public exploit code is available
- A fix is available
Affected software
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