---
cve: "CVE-2021-29434"
severity: "MEDIUM"
cvss: 6.1
epss: "63%"
vendor: "wagtail"
kev: false
exploited: false
published: "2021-04-19 19:15:17"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-02T03:09:13+02:00"
---

# CVE-2021-29434

> 6.1 MEDIUM · 🧪 PoC

## Beschreibung

Wagtail is a Django content management system. In affected versions of Wagtail, when saving the contents of a rich text field in the admin interface, Wagtail does not apply server-side checks to ensure that link URLs use a valid protocol. A malicious user with access to the admin interface could thus craft a POST request to publish content with `javascript:` URLs containing arbitrary code. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin. See referenced GitHub advisory for additional details, including a workaround. Patched versions have been released as Wagtail 2.11.7 (for the LTS 2.11 branch) and Wagtail 2.12.4 (for the current 2.12 branch).

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 4ddfb4809663655bbaae66d0bf6152c5033c738b (Commit)
- 904b54804cbb81a91944101f6b2965359134f5b4 (Commit)

## Referenzen

- <https://github.com/wagtail/wagtail/security/advisories/GHSA-wq5h-f9p5-q7fx>
- <https://pypi.org/project/wagtail/>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2021-29434) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_