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

https://notcve.org/view.php?id=CVE-2021-29434

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. • https://github.com/wagtail/wagtail/security/advisories/GHSA-wq5h-f9p5-q7fx https://pypi.org/project/wagtail • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') •