{"id":"CVE-2021-29434","aliases":["GHSA-wq5h-f9p5-q7fx","PYSEC-2021-114"],"url":"https://o3.security/vulnerability/CVE-2021-29434","summary":"Improper validation of URLs ('Cross-site Scripting') in Wagtail rich text fields","details":"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).","published":"2021-04-19T19:15:17.610Z","modified":"2026-07-09T01:30:31.769834Z","cvss":{"score":4.8,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"wagtail","fixedVersion":"2.11.7"},{"ecosystem":"PyPI","name":"wagtail","fixedVersion":"2.12.4"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/wagtail/wagtail/security/advisories/GHSA-wq5h-f9p5-q7fx"},{"type":"PACKAGE","url":"https://pypi.org/project/wagtail/"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T01:30:31.769834Z"}}