CVE-2026-49978 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-49978MEDIUM

cure53 DOMPurify — DOMPurify IN_PLACE Sanitization Bypass via Attached Shadow Root Inside <template>.content

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   A   N   N   N    6.3   .0033   26.4     —

AFFECTED
  Product    Versions   Fixed
  DOMPurify  < 3.4.6 –  —

TIMELINE
  Jun 2   Reserved by GitHub_M
  Jul 14  EXPLOIT PUBLISHED — CVE-2026-49978 (cure53 DOMPurify). Public exploit reference added.
  Jul 14  Published (CNA: GitHub_M)
  Jul 21  EXPLOIT PUBLISHED — CVE-2026-49978 (cure53 DOMPurify). Public exploit reference added.

CWE-79 · CNA: GitHub_M · CVSS v4.0 · 3 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
June 2, 2026	Reserved	Reserved by GitHub_M
July 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-49978 (cure53 DOMPurify). Public exploit reference added.
July 14, 2026	Published	Published (CNA: GitHub_M)
July 21, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-49978 (cure53 DOMPurify). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
cure53	DOMPurify	—	< 3.4.6	—

Weaknesses

CWE-79

References (3)

https://github.com/cure53/DOMPurify/commit/ca30f070c360df162a3e3848e80e6fd3c9e74bff [Patch]
https://github.com/cure53/DOMPurify/releases/tag/3.4.7 [Release Notes]
https://github.com/cure53/DOMPurify/security/advisories/GHSA-rp9w-3fw7-7cwq [Vendor Advisory, Exploit]

Authoritative record: CVE-2026-49978 at cve.org

Vendors: cure53

Weaknesses: CWE-79

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-49978 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.