Missing Authorization Affecting django-cms package, versions [,5.0.9)
Threat Intelligence
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- published30 Aug 2026
- disclosed20 Aug 2026
- creditUnknown
Introduced: 20 Aug 2026
NewCVE-2026-63003 (opens in a new tab)How to fix?
Upgrade django-cms to version 5.0.9 or higher.
Overview
Affected versions of this package are vulnerable to Missing Authorization via the DuplicatePageForm.clean_source bypass in cms/admin/forms.py. The source field in DuplicatePageForm is a hidden field whose value is fully controlled by the client on POST, and its queryset spans every page on every site. Because has_add_permission only checks that the user may create a page — not that they may read the source — a staff user with only "add page" rights can supply an arbitrary page ID as source and duplicate any page, thereby reading its plugin content while bypassing per-page view restrictions and multi-site isolation. Additionally, copy(..., permissions=False) strips the source page's view restrictions from the copy, leaving the duplicated page fully readable. A separate issue in GenericCmsPermissionForm also allowed managers to grant permissions beyond their own privilege level.