GHSA-4XFR-4P46-GC6P
Vulnerability from github – Published: 2026-08-20 18:42 – Updated: 2026-08-20 18:42Summary
The clipboard copy paths of the copy_plugins admin endpoint validate only the target (the user's own clipboard) and skip source-side authorization. A staff user can copy plugins out of a placeholder they have no permission on into their clipboard, then read the (secret) content.
### Details
In cms/admin/placeholderadmin.py, _copy_plugin_to_clipboard and _copy_placeholder_to_clipboard check has_copy_plugins_permission, which only evaluates request.toolbar.clipboard.has_add_plugins_permission(...) — the
clipboard belongs to the requesting user, and check_source is likewise applied only to the clipboard. The source placeholder identified by the attacker-supplied source_placeholder_id / source_plugin_id is never authorization-checked. (The placeholder-to-placeholder copy path, has_copy_from_placeholder_permission, correctly checks both sides.)
### Impact A staff user holding the global add permission for a plugin type, but with no access to a given placeholder/page, can copy that placeholder's plugins into their own clipboard and read content (e.g. link names/URLs, text) they cannot reach through the normal edit endpoints.
Requires CMS_PERMISSION=True with per-placeholder/page restrictions.
### Patches
Fixed in 5.0.8: the clipboard copy paths now also verify source-side permission (has_add_plugins_permission + check_source on the source placeholder), matching placeholder-to-placeholder copy.
### Workarounds None. Upgrade is recommended.
### Credits Reported by the security team at the University of Sydney ([@reporter]).
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "django-cms"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.0.8"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-54622"
],
"database_specific": {
"cwe_ids": [
"CWE-639"
],
"github_reviewed": true,
"github_reviewed_at": "2026-08-20T18:42:11Z",
"nvd_published_at": null,
"severity": "MODERATE"
},
"details": "### Summary\n The clipboard copy paths of the `copy_plugins` admin endpoint validate only the target (the user\u0027s own clipboard) and skip source-side authorization. A staff user can copy plugins out of a placeholder they have no permission on into their clipboard, then read the (secret) content.\n\n ### Details\n In `cms/admin/placeholderadmin.py`, `_copy_plugin_to_clipboard` and `_copy_placeholder_to_clipboard` check `has_copy_plugins_permission`, which only evaluates `request.toolbar.clipboard.has_add_plugins_permission(...)` \u2014 the\n clipboard belongs to the requesting user, and `check_source` is likewise applied only to the clipboard. The source placeholder identified by the attacker-supplied `source_placeholder_id` / `source_plugin_id` is never authorization-checked. (The placeholder-to-placeholder copy path, `has_copy_from_placeholder_permission`, correctly checks both sides.)\n\n ### Impact\n A staff user holding the global add permission for a plugin type, but with no access to a given placeholder/page, can copy that placeholder\u0027s plugins into their own clipboard and read content (e.g. link names/URLs, text) they cannot reach through the normal edit endpoints.\n\n Requires `CMS_PERMISSION=True` with per-placeholder/page restrictions.\n\n ### Patches\n Fixed in 5.0.8: the clipboard copy paths now also verify source-side permission (`has_add_plugins_permission` + `check_source` on the source placeholder), matching placeholder-to-placeholder copy.\n\n ### Workarounds\n None. Upgrade is recommended.\n\n ### Credits\n Reported by the security team at the University of Sydney ([@reporter]).",
"id": "GHSA-4xfr-4p46-gc6p",
"modified": "2026-08-20T18:42:11Z",
"published": "2026-08-20T18:42:11Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/django-cms/django-cms/security/advisories/GHSA-4xfr-4p46-gc6p"
},
{
"type": "WEB",
"url": "https://github.com/django-cms/django-cms/pull/8645"
},
{
"type": "WEB",
"url": "https://github.com/django-cms/django-cms/commit/7642a98ab3170793c0b27b4125dd1f3d318b8a1c"
},
{
"type": "PACKAGE",
"url": "https://github.com/django-cms/django-cms"
},
{
"type": "WEB",
"url": "https://github.com/django-cms/django-cms/releases/tag/5.0.8"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
],
"summary": "django CMS: Clipboard copy IDOR discloses unauthorized plugin content"
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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