CVE-2021-29434

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).

How to fix CVE-2021-29434

To remediate CVE-2021-29434, upgrade the affected package to a fixed version below.

• —upgrade to 2.11.7 or later
• —upgrade to 2.11.7 or later

Is CVE-2021-29434 being exploited?

Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 2.11.7
• >= 2.11, < 2.11.7, from 0, < 2.11.6, >= 2.12, < 2.12.4

CVSS scores

References (9)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-29434
• PATCHgithub.com/wagtail/wagtail
• PATCHpypi.org/project/wagtail/
• WEBgithub.com/pypa/advisory-database/tree/main/vulns/wagtail/PYSEC-2021-114.yaml
• WEB