CVE-2026-54622: django CMS Clipboard Copy IDOR Discloses Unauthorized Vulnerability

MODERATE
Advisory Identifier: GHSA-4xfr-4p46-gc6p
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CVSS 6.5
CWE-639
Published
Advisory Summary

CVE-2026-54622 is a MODERATE (CVSS 6.5) clipboard copy idor discloses unauthorized vulnerability (CWE-639: Authorization Bypass Through User-Controlled Key) affecting django CMS libraries in the PyPI ecosystem. The issue involves clipboard copy idor discloses unauthorized plugin content. Remediation is available by upgrading affected packages to version 5.0.8.

CVE-2026-54622 at a Glance

CVE Identifier CVE-2026-54622
GHSA Identifier GHSA-4xfr-4p46-gc6p
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-639: Authorization Bypass Through User-Controlled Key
Affected Product django CMS
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-54622

To remediate this vulnerability, upgrade all affected django CMS dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

django-cms fixed: 5.0.8 
pip install django-cms>=5.0.8
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show django-cms

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-54622, inspect your installed packages using pip:

pip show django-cms

Analyze the terminal output to locate any version of django CMS in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.0.8), your application is affected.

Note: The pip show django-cms command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-639: Authorization Bypass Through User-Controlled Key, where the system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. In django CMS, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Summary 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]).

CVE-2026-54622 Affected django CMS Versions

1 component(s)
Fixed Versions:
5.0.8
Product / Package Ecosystem Affected Versions Fixed Version
django-cms
pypi/django-cms
PyPI
< 5.0.8
5.0.8

References

GitHub Advisory / Wiki ADVISORY
https://github.com/django-cms/django-cms/security/advisories/GHSA-4xfr-4p46-gc6p
django CMS Source Repository REPOSITORY
https://github.com/django-cms/django-cms/pull/8645
Security Fix Commit FIX COMMIT
https://github.com/django-cms/django-cms/commit/7642a98ab3170793c0b27b4125dd1f3d318b8a1c
django CMS Source Repository REPOSITORY
https://github.com/django-cms/django-cms
django CMS Release RELEASE
https://github.com/django-cms/django-cms/releases/tag/5.0.8

Frequently Asked Questions

What is CVE-2026-54622?
CVE-2026-54622 is a security vulnerability in django CMS involving Clipboard copy IDOR discloses unauthorized plugin content under CWE-639: Authorization Bypass Through User-Controlled Key.
Which django CMS versions are affected?
Affected versions include releases prior to 5.0.8 across affected packages: django-cms.
What version fixes CVE-2026-54622?
Upgrading to 5.0.8 (or the latest patched release for your respective branch) resolves the vulnerability.
Is django-cms affected?
Yes, django-cms is affected in releases prior to 5.0.8. Upgrade your dependency to 5.0.8 or later.
What is the CVSS score of CVE-2026-54622?
CVE-2026-54622 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2026-54622?
CVE-2026-54622 is classified under CWE-639: Authorization Bypass Through User-Controlled Key (The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.).
How can I check PyPI dependencies for CVE-2026-54622?
Run the dependency tree command: 'pip show django-cms'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4xfr-4p46-gc6p",
  "modified" : "2026-08-20T18:42:11Z",
  "published" : "2026-08-20T18:42:11Z",
  "aliases" : [ "CVE-2026-54622" ],
  "summary" : "django CMS: Clipboard copy IDOR discloses unauthorized plugin content",
  "details" : "### Summary\n  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.\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(...)` — 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's 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]).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "django-cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.0.8"
      } ]
    } ]
  } ],
  "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"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-639" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-20T18:42:11Z",
    "nvd_published_at" : null
  }
}