{"id":"PYSEC-2026-2883","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-2026-2880","PYSEC-2026-2886","PYSEC-2026-736"],"modified":"2026-07-13T16:43:11.751432633Z","published":"2026-07-09T16:49:32.608304Z","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-event"}],"affected":[{"package":{"name":"plone-app-event","ecosystem":"PyPI","purl":"pkg:pypi/plone-app-event"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.10"}]}],"versions":["1.0","1.0.1","1.0.2","1.0.3","1.0.4","1.0.5","1.0.6","1.0a1","1.0a2","1.0b1","1.0b2","1.0b3","1.0b4","1.0b5","1.0b6","1.0b7","1.0b8","1.0rc1","1.0rc2","1.0rc3","1.1","1.1.1","1.1.10","1.1.11","1.1.12","1.1.13","1.1.2","1.1.3","1.1.4","1.1.5","1.1.6","1.1.7","1.1.8","1.1.a1","1.1b1","1.2","1.2.1","1.2.2","1.2.3","1.2.4","1.2.5","1.2.6","1.2.7","2.0","2.0.1","2.0.10","2.0.11","2.0.12","2.0.13","2.0.14","2.0.15","2.0.2","2.0.3","2.0.4","2.0.5","2.0.6","2.0.7","2.0.8","2.0.9","2.0a1","2.0a10","2.0a11","2.0a12","2.0a13","2.0a2","2.0a3","2.0a4","2.0a5","2.0a6","2.0a7","2.0a8","2.0a9","2.0b1","2.0b2","3.0","3.0.1","3.0.2","3.0.3","3.0.4","3.0.5","3.0.6","3.0.7","3.1","3.1.1","3.2.0","3.2.1","3.2.2","3.2.3","3.2.4","3.2.5","3.2.6","3.2.7","3.2.8","3.2.9"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/plone-app-event/PYSEC-2026-2883.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"}]}