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Vulnerability record · CVE-2020-28734 · published 30 December 2020

CVE-2020-28734: Plone xml external entity (xxe) vulnerability

Plone · Plone

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

8.8 CVSS 3.1 High EPSS 1.5% · top 27.6% CWE-611 · XML external entity (XXE)
8.8CVSS 3.1 base score, v2 6.5
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

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

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://dist.plone.org/release/5.2.3/RELEASE-NOTES.txt Release NotesVendor Advisory
https://github.com/plone/Products.CMFPlone/issues/3209 PatchThird Party Advisory
https://www.misakikata.com/codes/plone/python-en.html Broken Link
https://dist.plone.org/release/5.2.3/RELEASE-NOTES.txt Release NotesVendor Advisory
https://github.com/plone/Products.CMFPlone/issues/3209 PatchThird Party Advisory
https://www.misakikata.com/codes/plone/python-en.html Broken Link

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Source: NIST National Vulnerability Database (record CVE-2020-28734), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.