CVE-2026-49978 | THREATINT

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 <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 Reserved 2026-06-02 | Published 2026-07-14 | Updated 2026-07-14 | Assigner GitHub_M

MEDIUM: 6.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

Problem types

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

Product status

< 3.4.6

affected

References

github.com/...Purify/security/advisories/GHSA-rp9w-3fw7-7cwq

github.com/...ommit/ca30f070c360df162a3e3848e80e6fd3c9e74bff

github.com/cure53/DOMPurify/releases/tag/3.4.7

cve.org (CVE-2026-49978)

nvd.nist.gov (CVE-2026-49978)

Download JSON