---
cve: "CVE-2026-49978"
severity: "MEDIUM"
cvss: 6.3
epss: "33%"
vendor: "cure53"
kev: false
exploited: false
published: "2026-07-14 21:17:02"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-12T00:13:21+02:00"
---

# CVE-2026-49978

> 6.3 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- bb7739e5bccec7e1ab3dae3f3e42d02db3acaaae (Commit)

## Referenzen

- <https://github.com/cure53/DOMPurify/security/advisories/GHSA-rp9w-3fw7-7cwq>
- <https://github.com/cure53/DOMPurify/commit/ca30f070c360df162a3e3848e80e6fd3c9e74bff>
- <https://github.com/cure53/DOMPurify/releases/tag/3.4.7>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-49978) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_