{"id":"CVE-2021-29434","aliases":["EUVD-2021-0462","GHSA-wq5h-f9p5-q7fx","PYSEC-2021-114"],"status":"published","title":"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).","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00626,"percentile":0.50296,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2021-04-19T18:45:14Z","modified":"2026-10-20T10:54:37Z","fixes":[{"ecosystem":"PyPI","package":"wagtail","fixed_in":["2.12.4","2.11.7","2.11.6"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"wagtail","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12"},{"last_affected":"2.12.3"},{"fixed":"2.12.4"}]}]},{"source":"ghsa","ecosystem":"PyPI","package":"wagtail","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.11.6"},{"fixed":"2.11.7"}]}]},{"source":"osv","ecosystem":"PyPI","package":"wagtail","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.11.7"}]}],"versions":["0.1","0.2","0.3","0.3.1","0.4","0.4.1","0.5","0.6","0.7","0.8","0.8.1","0.8.10","0.8.2","0.8.3","0.8.4","0.8.5","0.8.6","0.8.7","0.8.8","0.8.9","1.0","1.0b1","1.0b2","1.0rc1","1.0rc2","1.1","1.10","1.10.1","1.10rc1","1.11","1.11.1","1.11rc1","1.12","1.12.1","1.12.2","1.12.3","1.12.4","1.12.5","1.12.6","1.12rc1","1.13","1.13.1","1.13.2","1.13.3","1.13.4","1.13rc1","1.1rc1","1.2","1.2rc1","1.3","1.3.1","1.3rc1","1.4","1.4.1","1.4.2","1.4.3","1.4.4","1.4.5","1.4.6","1.4rc1","1.5","1.5.1","1.5.2","1.5.3","1.5rc1","1.6","1.6.1","1.6.2","1.6.3","1.6rc1","1.7","1.7rc1","1.8","1.8.1","1.8.2","1.8rc1","1.9","1.9.1","1.9rc1","2.0","2.0.1","2.0.2","2.0b1","2.0rc1","2.1","2.1.1","2.1.2","2.1.3","2.10","2.10.1","2.10.2","2.10rc1","2.10rc2","2.11","2.11.1","2.11.2","2.11.3","2.11.4","2.11.5","2.11.6","2.11rc1","2.1rc1","2.1rc2","2.2","2.2.1","2.2.2","2.2rc1","2.2rc2","2.3","2.3rc1","2.3rc2","2.4","2.4rc1","2.5","2.5.1","2.5.2","2.5rc1","2.6","2.6.1","2.6.2","2.6.3","2.6rc1","2.7","2.7.1","2.7.2","2.7.3","2.7.4","2.7rc1","2.7rc2","2.8","2.8.1","2.8.2","2.8rc1","2.9","2.9.1","2.9.2","2.9.3","2.9rc1"]},{"source":"osv","ecosystem":"PyPI","package":"wagtail","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12"},{"fixed":"2.12.4"}]}],"versions":["2.12","2.12.1","2.12.2","2.12.3"]},{"source":"osv","ecosystem":"PyPI","package":"wagtail","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.11"},{"fixed":"2.11.7"},{"introduced":"0"},{"fixed":"2.11.6"},{"introduced":"2.12"},{"fixed":"2.12.4"}]}],"versions":["0.1","0.2","0.3","0.3.1","0.4","0.4.1","0.5","0.6","0.7","0.8","0.8.1","0.8.2","0.8.3","0.8.4","0.8.5","0.8.6","0.8.7","0.8.8","0.8.9","0.8.10","1.0b1","1.0b2","1.0rc1","1.0rc2","1.0","1.1rc1","1.1","1.2rc1","1.2","1.3rc1","1.3","1.3.1","1.4rc1","1.4","1.4.1","1.4.2","1.4.3","1.4.4","1.4.5","1.4.6","1.5rc1","1.5","1.5.1","1.5.2","1.5.3","1.6rc1","1.6","1.6.1","1.6.2","1.6.3","1.7rc1","1.7","1.8rc1","1.8","1.8.1","1.8.2","1.9rc1","1.9","1.9.1","1.10rc1","1.10","1.10.1","1.11rc1","1.11","1.11.1","1.12rc1","1.12","1.12.1","1.12.2","1.12.3","1.12.4","1.12.5","1.12.6","1.13rc1","1.13","1.13.1","1.13.2","1.13.3","1.13.4","2.0b1","2.0rc1","2.0","2.0.1","2.0.2","2.1rc1","2.1rc2","2.1","2.1.1","2.1.2","2.1.3","2.2rc1","2.2rc2","2.2","2.2.1","2.2.2","2.3rc1","2.3rc2","2.3","2.4rc1","2.4","2.5rc1","2.5","2.5.1","2.5.2","2.6rc1","2.6","2.6.1","2.6.2","2.6.3","2.7rc1","2.7rc2","2.7","2.7.1","2.7.2","2.7.3","2.7.4","2.8rc1","2.8","2.8.1","2.8.2","2.9rc1","2.9","2.9.1","2.9.2","2.9.3","2.10rc1","2.10rc2","2.10","2.10.1","2.10.2","2.11rc1","2.11","2.11.1","2.11.2","2.11.3","2.11.4","2.11.5","2.11.6","2.12","2.12.1","2.12.2","2.12.3"]}],"products":[{"vendor":"torchbox","product":"wagtail"},{"vendor":"wagtail","product":"wagtail"}],"references":[{"url":"https://github.com/wagtail/wagtail/security/advisories/GHSA-wq5h-f9p5-q7fx","tags":["x_refsource_CONFIRM","x_transferred","Mitigation","Third Party Advisory","advisory","web"]},{"url":"https://pypi.org/project/wagtail/","tags":["x_refsource_MISC","x_transferred","Product","Third Party Advisory","package"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29434","tags":["advisory"]},{"url":"https://github.com/wagtail/wagtail/commit/5c7a60977cba478f6a35390ba98cffc2bd41c8a4","tags":["web"]},{"url":"https://github.com/wagtail/wagtail/commit/915f6ed2bd7d53154103cc4424a0f18695cdad6c","tags":["web"]},{"url":"https://github.com/wagtail/wagtail/compare/v2.11.6...v2.11.7","tags":["web"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/wagtail/PYSEC-2021-114.yaml","tags":["web"]},{"url":"https://pypi.org/project/wagtail","tags":["web"]},{"url":"https://github.com/advisories/GHSA-wq5h-f9p5-q7fx"},{"url":"https://github.com/wagtail/wagtail","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-29434","title":"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).","status":"published","published":"2021-04-19T18:45:14Z","modified":"2024-08-03T22:02:51.911Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:33:06.658806Z"}],"euvd":[{"id":"EUVD-2021-0462","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).","status":"published","published":"2021-04-19T18:45:14Z","modified":"2024-08-03T22:02:51Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N","level":"medium"}],"updated_at":"2026-11-03T03:24:45.541615Z"}],"ghsa":[{"id":"GHSA-wq5h-f9p5-q7fx","title":"Improper validation of URLs ('Cross-site Scripting') in Wagtail rich text fields","description":"### Impact\nWhen 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.\n\n### Patches\nPatched 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).\n\n### Workarounds\nFor sites that cannot easily upgrade to a current supported version, the vulnerability can be patched by adding the following code to a `wagtail_hooks.py` module in any installed app:\n\n```python\nfrom draftjs_exporter.dom import DOM\nfrom wagtail.admin.rich_text.converters.html_to_contentstate import ExternalLinkElementHandler, PageLinkElementHandler\nfrom wagtail.core import hooks\nfrom wagtail.core.whitelist import check_url\n\n\ndef link_entity(props):\n    id_ = props.get('id')\n    link_props = {}\n\n    if id_ is not None:\n        link_props['linktype'] = 'page'\n        link_props['id'] = id_\n    else:\n        link_props['href'] = check_url(props.get('url'))\n\n    return DOM.create_element('a', link_props, props['children'])\n\n\n@hooks.register('register_rich_text_features', order=1)\ndef register_link(features):\n    features.register_converter_rule('contentstate', 'link', {\n        'from_database_format': {\n            'a[href]': ExternalLinkElementHandler('LINK'),\n            'a[linktype=\"page\"]': PageLinkElementHandler('LINK'),\n        },\n        'to_database_format': {\n            'entity_decorators': {'LINK': link_entity}\n        }\n    })\n```\n\n### Acknowledgements\nMany thanks to Kevin Breen for reporting this issue.\n\n### For more information\nIf you have any questions or comments about this advisory:\n\n* Visit Wagtail's [support channels](https://docs.wagtail.io/en/stable/support.html)\n* Email us at security@wagtail.io (if you wish to send encrypted email, the public key ID is `0x6ba1e1a86e0f8ce8`)","status":"published","published":"2021-04-20T14:02:30Z","modified":"2024-11-19T16:02:33Z","cvss":[{"version":"4.0","score":8.4,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:38:20.833758Z"}],"nvd":[{"id":"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).","status":"published","published":"2021-04-19T19:15:17.61Z","modified":"2026-06-17T03:47:38.06Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":3.5,"vector":"AV:N/AC:M/Au:S/C:N/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:06:52.03307Z"}],"osv":[{"id":"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).","status":"published","published":"2021-04-19T19:15:17.61Z","modified":"2026-10-20T10:54:37.183456796Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:19.129331Z"},{"id":"GHSA-wq5h-f9p5-q7fx","title":"Improper validation of URLs ('Cross-site Scripting') in Wagtail rich text fields","description":"### Impact\nWhen 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.\n\n### Patches\nPatched 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).\n\n### Workarounds\nFor sites that cannot easily upgrade to a current supported version, the vulnerability can be patched by adding the following code to a `wagtail_hooks.py` module in any installed app:\n\n```python\nfrom draftjs_exporter.dom import DOM\nfrom wagtail.admin.rich_text.converters.html_to_contentstate import ExternalLinkElementHandler, PageLinkElementHandler\nfrom wagtail.core import hooks\nfrom wagtail.core.whitelist import check_url\n\n\ndef link_entity(props):\n    id_ = props.get('id')\n    link_props = {}\n\n    if id_ is not None:\n        link_props['linktype'] = 'page'\n        link_props['id'] = id_\n    else:\n        link_props['href'] = check_url(props.get('url'))\n\n    return DOM.create_element('a', link_props, props['children'])\n\n\n@hooks.register('register_rich_text_features', order=1)\ndef register_link(features):\n    features.register_converter_rule('contentstate', 'link', {\n        'from_database_format': {\n            'a[href]': ExternalLinkElementHandler('LINK'),\n            'a[linktype=\"page\"]': PageLinkElementHandler('LINK'),\n        },\n        'to_database_format': {\n            'entity_decorators': {'LINK': link_entity}\n        }\n    })\n```\n\n### Acknowledgements\nMany thanks to Kevin Breen for reporting this issue.\n\n### For more information\nIf you have any questions or comments about this advisory:\n\n* Visit Wagtail's [support channels](https://docs.wagtail.io/en/stable/support.html)\n* Email us at security@wagtail.io (if you wish to send encrypted email, the public key ID is `0x6ba1e1a86e0f8ce8`)","status":"published","published":"2021-04-20T14:02:30Z","modified":"2026-09-10T03:49:26.868402781Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N","level":"medium"},{"version":"4.0","score":8.4,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:58.767335Z"},{"id":"PYSEC-2021-114","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).","status":"published","published":"2021-04-19T19:15:00Z","modified":"2023-11-08T04:05:33.896694Z","updated_at":"2026-11-02T15:52:52.682031Z"}]}}