CVE-2026-87975 Privilege abuse in model formsets with editable primary keys
Authenticated users can delete unauthorized database rows by exploiting editable primary keys in Django model formsets.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-87975?
CVE-2026-87975 is a medium-severity missing authorization vulnerability in djangoproject Django, published on 6 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue was discovered in Django 6.1 before 6.1.2, 6.0 before 6.0.9, and 5.2 before 5.2.18. `django.forms.models.BaseModelFormSet.save_existing_objects()` used the presence of a primary key on a submitted form's instance as evidence that the instance belonged to the formset's limiting queryset. An object outside that queryset is represented by a newly constructed instance whose primary key can still be populated from submitted data when the model's primary key is a field accepted by the form, such as a `OneToOneField` or parent link used as the primary key of an inline formset's model, or a natural or UUID primary key included in the form's fields. This allows an authenticated user permitted to submit such a formset to delete rows outside the limiting queryset, without any permission on the targeted object, via forged management-form data marking an out-of-queryset object for deletion. Models using the default AutoField primary key are not affected. Earlier, unsupported Django series (such as 5.1.x, 5.0.x, and 4.2.x) were not evaluated and may also be affected. Django would like to thank Seonggwon Yoon for reporting this issue.
Weakness: CWE-639
Which versions are affected by CVE-2026-87975?
How do I fix CVE-2026-87975?
Upgrade to a fixed version.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-87975 being exploited?
There is no known exploitation of CVE-2026-87975 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-87975, GHSA-x869-hccf-fv7r, UBUNTU-CVE-2026-87975.