Improper Restriction of XML External Entity Reference in Plone
Plone before 5.2.3 allows XXE attacks via a feature that is protected by an unapplied permission of plone.schemaeditor.ManageSchemata (therefore, only available to the Manager role).
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | plone | < 5.2.3 | 5.2.3 |
| Python (PyPI) | plone-app-dexterity | < 2.6.8 | 2.6.8 |
| Python (PyPI) | plone-app-event | < 3.2.10 | 3.2.10 |
| Python (PyPI) | plone-app-theming | < 4.1.6 | 4.1.6 |
| Python (PyPI) | plone-supermodel | < 1.6.3 | 1.6.3 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2020-28736
- https://github.com/plone/Products.CMFPlone/issues/3209
- https://dist.plone.org/release/5.2.3/RELEASE-NOTES.txt
- https://github.com/advisories/GHSA-2c8c-84w2-j38j
- https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2020-248.yaml
- https://www.misakikata.com/codes/plone/python-en.html
- https://pypi.org/project/plone-app-dexterity
- https://pypi.org/project/plone-app-event
- https://pypi.org/project/plone-app-theming
- https://pypi.org/project/plone-supermodel
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-611- Platform
- Python (PyPI)
- Package
plone, plone-app-dexterity, plone-app-event- Disclosed
- 30.12.2020
- Updated
- 11.10.2026 14:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2020-248 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-2879 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-2882 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-2885 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-2c8c-84w2-j38j - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-735 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: plone-app-theming
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 12.2020 12.2020
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 3
Disclosures per year
- 2020: 3
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 0
-
Improper Restriction of XML External Entity Reference in Plone this entry
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.