{"id":"PYSEC-2026-2880","summary":"Improper Restriction of XML External Entity Reference in Plone","details":"Plone before 5.2.3 allows XXE attacks via a feature that is explicitly only available to the Manager role.","aliases":["CVE-2020-28734","GHSA-wq6x-g685-w5f2","PYSEC-2020-246","PYSEC-2026-2883","PYSEC-2026-2886","PYSEC-2026-736"],"modified":"2026-07-13T16:43:11.751432633Z","published":"2026-07-09T16:49:32.923312Z","references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-28734"},{"type":"WEB","url":"https://github.com/plone/Products.CMFPlone/issues/3209"},{"type":"WEB","url":"https://dist.plone.org/release/5.2.3/RELEASE-NOTES.txt"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-wq6x-g685-w5f2"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2020-246.yaml"},{"type":"WEB","url":"https://www.misakikata.com/codes/plone/python-en.html"},{"type":"PACKAGE","url":"https://pypi.org/project/plone-app-dexterity"}],"affected":[{"package":{"name":"plone-app-dexterity","ecosystem":"PyPI","purl":"pkg:pypi/plone-app-dexterity"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.8"}]}],"versions":["1.0","1.0.1","1.0.2","1.0.3","1.0a1","1.0a2","1.0a3","1.0a4","1.0a5","1.0a6","1.0a7","1.0b1","1.0b2","1.0b3","1.0b4","1.0rc1","1.1","1.2","1.2.1","1.2.2","2.0","2.0.1","2.0.10","2.0.11","2.0.12","2.0.13","2.0.14","2.0.15","2.0.16","2.0.17","2.0.18","2.0.19","2.0.2","2.0.3","2.0.4","2.0.5","2.0.6","2.0.7","2.0.8","2.0.9","2.1.0","2.1.1","2.1.10","2.1.11","2.1.12","2.1.13","2.1.14","2.1.15","2.1.16","2.1.17","2.1.18","2.1.19","2.1.2","2.1.20","2.1.3","2.1.4","2.1.5","2.1.6","2.1.7","2.1.8","2.1.9","2.2.0","2.3.0","2.3.1","2.3.2","2.3.3","2.3.4","2.3.5","2.3.6","2.3.7","2.3.8","2.3.9","2.4.0","2.4.1","2.4.10","2.4.2","2.4.3","2.4.4","2.4.5","2.4.6","2.4.7","2.4.8","2.4.9","2.5.0","2.5.1","2.5.2","2.5.3","2.6.0","2.6.1","2.6.2","2.6.3","2.6.4","2.6.5","2.6.6","2.6.7"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/plone-app-dexterity/PYSEC-2026-2880.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}