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CVE-2026-49978

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-49978

Severity

Unknown
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Summary

DOMPurify IN_PLACE Sanitization Bypass via Attached Shadow Root Inside <template>.content

Description

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 .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.

References

Affected packages

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