CVE-2021-29434

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

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).

Category

6.1
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.27%
Third-Party Advisory github.com Third-Party Advisory pypi.org
Affected: wagtail wagtail
Published at:
Updated at:

References

Link Tags
https://github.com/wagtail/wagtail/security/advisories/GHSA-wq5h-f9p5-q7fx third party advisory mitigation
https://pypi.org/project/wagtail/ third party advisory product

Frequently Asked Questions

What is the severity of CVE-2021-29434?
CVE-2021-29434 has been scored as a medium severity vulnerability.
How to fix CVE-2021-29434?
To fix CVE-2021-29434, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-29434 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-29434 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-29434?
CVE-2021-29434 affects wagtail wagtail.
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