PYSEC-2026-3822

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/django-cms/PYSEC-2026-3822.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-3822
Aliases
Published
2026-09-10T09:44:53Z
Modified
2026-09-10T12:15:03Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H CVSS Calculator
Summary
django CMS: Plugin move endpoint allows cyclic reparenting (DoS)
Details

Summary

The move_plugin admin endpoint does not prevent a plugin from being reparented under itself or one of its own descendants. Doing so creates a cycle in the plugin tree, after which the recursive descendant/ancestor SQL queries loop without terminating, stalling the request worker.

Details

move_plugin (in cms/admin/placeholderadmin.py) accepts a plugin_parent POST parameter and, for an in-placeholder move, sets the plugin's parent to the target without any cycle/ancestor check. If the target parent is a descendant of the moved plugin, the resulting parent_id graph contains a cycle.

Descendant and ancestor traversal is implemented with WITH RECURSIVE CTEs (_get_descendants_cte / _get_ancestors_cte in cms/models/pluginmodel.py) that have no cycle clause or depth limit. On a cyclic tree these recurse indefinitely (PostgreSQL/SQLite) or error at the recursion limit (MySQL). get_descendants() is invoked while building the move response and on subsequent operations on the affected subtree.

Impact

An authenticated staff user with permission to change plugins in at least one placeholder can corrupt that placeholder's plugin tree, causing requests that traverse it (rendering, copy, delete) to hang and consume application workers (denial of service). The tree is also left in a corrupted state.

Requires CMS_PERMISSION/plugin-change permission on a placeholder.

Patches

Fixed in 5.0.8: move_plugin now rejects (HTTP 400) any move that would place a plugin inside itself or one of its descendants, before any tree mutation or traversal.

Workarounds

None. Upgrade is recommended.

Credits

Reported by the security team at the University of Sydney ([@reporter]).

References

Affected packages

PyPI / django-cms

Package

Name
django-cms
View open source insights on deps.dev
Purl
pkg:pypi/django-cms

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.0.8

Affected versions

2.*
2.0.1
2.0.2
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.2
2.2.1
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
2.3.7
2.3.8
2.4.0
2.4.1
2.4.2
2.4.3
3.*
3.0
3.0.1
3.0.2
3.0.3
3.0.4
3.0.5
3.0.6
3.0.7
3.0.8
3.0.9
3.0.10
3.0.11
3.0.12
3.0.13
3.0.14
3.0.15
3.0.16
3.0.17
3.0.18
3.1.0.b1
3.1.0rc1
3.1.0rc2
3.1.0
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7
3.2.0
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.3.0rc2
3.3.0rc3
3.3.0rc4
3.3.0
3.3.1
3.3.2
3.3.3
3.3.4
3.4.0
3.4.1
3.4.2
3.4.3
3.4.4
3.4.5
3.4.6
3.4.7
3.5.0
3.5.1
3.5.2
3.5.3
3.5.4
3.6.0rc1
3.6.0rc3
3.6.0
3.6.1
3.7.0rc1
3.7.0rc2
3.7.0
3.7.1
3.7.2
3.7.3
3.7.4
3.8.0rc1
3.8.0
3.8.1
3.8.2
3.9.0rc1
3.9.0rc2
3.9.0rc3
3.9.0
3.10.0rc1
3.10.0rc2
3.10.0
3.10.1rc1
3.10.1
3.11.0
3.11.1rc1
3.11.1
3.11.2
3.11.3
3.11.4
3.11.5
3.11.6
3.11.7
3.11.8
3.11.9
3.11.10
3.11.11
4.*
4.1.0rc1
4.1.0rc2
4.1.0rc3
4.1.0rc4
4.1.0rc5
4.1.0
4.1.1
4.1.2
4.1.3
4.1.4
4.1.5
4.1.6
4.1.7
4.1.9
4.1.10
4.1.11
5.*
5.0.0a1
5.0.0
5.0.1
5.0.2
5.0.3
5.0.4
5.0.5
5.0.6
5.0.7

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/django-cms/PYSEC-2026-3822.yaml"