CVE-2020-28736 Improper Restriction of XML External Entity Reference in Plone

What is CVE-2020-28736?

CVE-2020-28736 is a high-severity vulnerability in Plone Plone, published on 30 Dec 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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).

Weakness: CWE-611

Which versions are affected by CVE-2020-28736?

15 open source packages ship an affected version, including plone, Plone and plone-app-dexterity. It affects 1 product.

Products include Plone Plone.

How do I fix CVE-2020-28736?

Upgrade plone to 5.2.3 or later.

Is CVE-2020-28736 being exploited?

There is no known exploitation of CVE-2020-28736 in the wild and no public exploit code.

Other vulnerabilities in Plone Plone

• CVE-2021-33509 Incorrect Permission Assignment for Critical Resource in Plone Critical 9.9
• CVE-2020-35190 Hardcoded credentials in n/a Critical 9.8
• CVE-2020-7941 Plone Unauthenticated Write Vulnerability Critical 9.8
• CVE-2011-3587 Zope Command Execution Vulnerability Critical 9.3
• CVE-2021-33926 Server-Side Request Forgery in Plone CMS High 8.8

All Plone Plone vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-2c8c-84w2-j38j, PYSEC-2020-248, PYSEC-2026-2879, PYSEC-2026-2882, PYSEC-2026-2885, PYSEC-2026-735.