# Django 4.2.9.dev20231204082947 - dokumentacja

# Django 2.1.9 release notes

June 3, 2019

Django 2.1.9 fixes security issues in 2.1.8.

## CVE-2019-12308: AdminURLFieldWidget XSS

The clickable „Current URL” link generated by `AdminURLFieldWidget` displayed the provided value without validating it as a safe URL. Thus, an unvalidated value stored in the database, or a value provided as a URL query parameter payload, could result in an clickable JavaScript link.

`AdminURLFieldWidget` now validates the provided value using `URLValidator` before displaying the clickable link. You may customize the validator by passing a `validator_class` kwarg to `AdminURLFieldWidget.__init__()`, e.g. when using `formfield_overrides`.

## Patched bundled jQuery for CVE-2019-11358: Prototype pollution

jQuery before 3.4.0, mishandles `jQuery.extend(true, {}, ...)` because of `Object.prototype` pollution. If an unsanitized source object contained an enumerable `__proto__` property, it could extend the native `Object.prototype`.

The bundled version of jQuery used by the Django admin has been patched to allow for the `select2` library’s use of `jQuery.extend()`.