CVE-2026-63003 django CMS: Broken access control in page *Duplicate* allows reading the content of any page (cross-site / restriction bypass)
Attackers can bypass access controls to read content from unauthorized pages via the page duplication feature in django CMS.
- 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-2026-63003?
CVE-2026-63003 is a medium-severity missing authorization vulnerability in django-cms, published on 20 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
django CMS is an easy-to-use and developer-friendly enterprise content management system powered by Django. Prior to 5.0.9, page duplication lacks an object-level authorization check on the source page. In cms/admin/forms.py, DuplicatePageForm.source accepts any Page, the AddPageForm constructor does not narrow a hidden source field, AddPageForm.clean does not validate the source against the user, and AddPageForm.save calls from_source. In cms/admin/pageadmin.py, duplicate and PageAdmin.has_add_permission check only whether a staff user may add a page. A crafted source value can therefore copy every placeholder and plugin from an unauthorized page with permissions=False, stripping source view restrictions and exposing content across sites or restricted subtrees when CMS_PERMISSION is enabled. This issue is fixed in versions 5.0.9.
Which versions are affected by CVE-2026-63003?
3 open source packages ship an affected version, including django-cms.
| Package | Affected | Fixed in |
|---|---|---|
django-cms PyPI | All versions | 5.0.9 |
django-cms PyPI | All versions | 5.0.9 |
django-cms PyPI | All versions | 5.0.9 |
How do I fix CVE-2026-63003?
Upgrade django-cms to 5.0.9 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-63003 being exploited?
There is no known exploitation of CVE-2026-63003 in the wild and no public exploit code.
Sources
Also known as GHSA-6x92-6vx4-5fwr, PYSEC-2026-3821.