What’s Vulnerable › Vulnerabilities

CVE-2021-29434: Improper validation of URLs ('Cross-site Scripting') in Wagtail rich text fields

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-19 · updated 2026-06-17
• Weakness: CWE-79

Description

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).

Affected products

• wagtail: before 2.11.6; from 2.11.0 before 2.11.7; from 2.12.0 before 2.12.4 — fixed in 2.11.6, 2.11.7, 2.12.4

How to fix

Upgrade to a fixed version: wagtail 2.11.6, 2.11.7, 2.12.4. Check the vendor advisory for mitigations.

References

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

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