HIGH8.8

PYSEC-2026-735

Improper Restriction of XML External Entity Reference in Plone

Quick fix

PYSEC-2026-735 — plone-supermodel: upgrade to the fixed version with the command below.

pip install --upgrade 'plone-supermodel>=1.6.3'

Details

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).

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/plone-supermodel

Introduced in: 0Fixed in: 1.6.3

Fixpip install --upgrade 'plone-supermodel>=1.6.3'

References

https://nvd.nist.gov/vuln/detail/CVE-2020-28736[ADVISORY]
https://github.com/plone/Products.CMFPlone/issues/3209[WEB]
https://dist.plone.org/release/5.2.3/RELEASE-NOTES.txt[WEB]
https://github.com/advisories/GHSA-2c8c-84w2-j38j[ADVISORY]
https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2020-248.yaml[WEB]
https://www.misakikata.com/codes/plone/python-en.html[WEB]
https://pypi.org/project/plone-supermodel[PACKAGE]