VULNERABILITY INTELLIGENCE

CVE-2026-49978

CVSS score6.1 MEDIUM

EPSS probability0.40%

CISA KEVNot currently listed

Published2026-07-14

Last modified2026-10-24

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

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.

Weakness classification

security-advisories@github.com: CWE-79

Primary references

security-advisories@github.com — Patch
security-advisories@github.com — Release Notes
security-advisories@github.com — Vendor Advisory, Exploit
134c704f-9b21-4f2e-91b3-4a467353bcc0 — Vendor Advisory, Exploit