What’s Vulnerable › Vulnerabilities

CVE-2020-28734

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-30 · updated 2026-06-17
• Weakness: CWE-611

Description

Plone before 5.2.3 allows XXE attacks via a feature that is explicitly only available to the Manager role.

Affected products

• Plone CMS: before 5.2.3 — fixed in 5.2.3

How to fix

Upgrade to a fixed version: Plone CMS 5.2.3. Check the vendor advisory for mitigations.

References

• https://dist.plone.org/release/5.2.3/RELEASE-NOTES.txt
• https://github.com/plone/Products.CMFPlone/issues/3209
• https://www.misakikata.com/codes/plone/python-en.html
• https://dist.plone.org/release/5.2.3/RELEASE-NOTES.txt
• https://github.com/plone/Products.CMFPlone/issues/3209
• https://www.misakikata.com/codes/plone/python-en.html

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