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Vulnerability · Published Aug 20, 2026 · Assigned by GitHub_M

CVE-2026-63003django CMS: Broken access control in page *Duplicate* allows reading the content of any page (cross-site / restriction bypass)

Medium 6.5

In plain English

A medium-severity authorization bypass via user-controlled key in django-cms from django-cms. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 64.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIdjango-cms5.0.9GHSA-6x92-6vx4-5fwr
PyPIdjango-cms5.0.9PYSEC-2026-3821

Affected products (as reported)

VendorProductVersions
django-cms django-cms < 5.0.9

Weakness: CWE-639, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References