Wagtail: Improper restriction handling on Pages admin API

NVD Description

### Impact The internal Pages admin [API](https://docs.wagtail.org/en/stable/advanced_topics/api/index.html) incorrectly returns page fields without access control when they are declared in `api_fields`. A user with access to the Wagtail admin can use this API to fetch draft and live page fields’ contents that are part of `api_fields` on the base page model (title, slug, seo_title, search_description), as well as all custom fields declared in `api_fields`. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin. ### Patches Patched versions have been released as Wagtail 7.0.9, 7.3.4, 7.4.3 and 8.0rc2. ### Workarounds Site owners unable to upgrade can apply the fix by overriding the relevant method on `PagesAdminAPIViewSet` to patch all vulnerable admin API endpoints: ```python # wagtail_hooks.py or AppConfig.ready() from wagtail.admin.api.views import PagesAdminAPIViewSet from wagtail.permissions import page_permission_policy def _restricted_get_base_queryset(self): return page_permission_policy.explorable_instances(self.request.user) PagesAdminAPIViewSet.get_base_queryset = _restricted_get_base_queryset ``` ### Acknowledgements Many thanks to xuliang@QAX for reporting this issue. ### For more information If you have any questions or comments about this advisory: - Visit Wagtail's [support channels](https://docs.wagtail.org/en/stable/support.html) - Email us at [security@wagtail.org](mailto:security@wagtail.org) (view our [security policy](https://github.com/wagtail/wagtail/security/policy) for more information).

Affected Packages (1)