---
cve: "CVE-2021-29447"
severity: "HIGH"
cvss: 7.1
epss: "85.7%"
vendor: "WordPress"
kev: false
exploited: false
published: "2021-04-15 21:15:17"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-02T15:33:57+02:00"
---

# CVE-2021-29447

> 7.1 HIGH · 🧪 PoC

## Beschreibung

Wordpress is an open source CMS. A user with the ability to upload files (like an Author) can exploit an XML parsing issue in the Media Library leading to XXE attacks. This requires WordPress installation to be using PHP 8. Access to internal files is possible in a successful XXE attack. This has been patched in WordPress version 5.7.1, along with the older affected versions via a minor release. We strongly recommend you keep auto-updates enabled.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Exploit-Evidenz

- [EDB-50304 — WordPress 5.7 - 'Media Library' XML External Entity Injection (XXE) (Authenticated)](https://www.exploit-db.com/exploits/50304)

## Patch verfügbar (OSV)

- 5e3f55fde8ff1adc4a750b0ed7b20c50068230c0 (Commit)
- b36d4f9b075a8afe25e36bc9745aad92fe0203ac (Commit)

## Referenzen

- <https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-rv47-pc52-qrhh>
- <https://wordpress.org/news/category/security/>
- <https://lists.debian.org/debian-lts-announce/2021/04/msg00017.html>
- <https://www.debian.org/security/2021/dsa-4896>
- <http://packetstormsecurity.com/files/163148/XML-External-Entity-Via-MP3-File-Upload-On-WordPress.html>
- <http://packetstormsecurity.com/files/164198/WordPress-5.7-Media-Library-XML-Injection.html>
- <https://blog.sonarsource.com/wordpress-xxe-security-vulnerability/>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2021-29447) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_