{"id":"PYSEC-2026-2885","summary":"Improper Restriction of XML External Entity Reference in Plone","details":"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).","aliases":["CVE-2020-28736","GHSA-2c8c-84w2-j38j","PYSEC-2020-248","PYSEC-2026-2879","PYSEC-2026-2882","PYSEC-2026-735"],"modified":"2026-07-13T16:43:28.446541636Z","published":"2026-07-09T16:49:33.282373Z","references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-28736"},{"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-2c8c-84w2-j38j"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2020-248.yaml"},{"type":"WEB","url":"https://www.misakikata.com/codes/plone/python-en.html"},{"type":"PACKAGE","url":"https://pypi.org/project/plone-app-theming"}],"affected":[{"package":{"name":"plone-app-theming","ecosystem":"PyPI","purl":"pkg:pypi/plone-app-theming"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.1.6"}]}],"versions":["1.0","1.0.1","1.0.2","1.0.3","1.0.4","1.0b1","1.0b2","1.0b3","1.0b4","1.0b5","1.0b6","1.0b7","1.0b8","1.0b9","1.1","1.1.1","1.1.2","1.1.3","1.1.4","1.1.5","1.1.6","1.1.7","1.1.8","1.1a1","1.1a2","1.1b1","1.1b2","1.2.0","1.2.1","1.2.10","1.2.11","1.2.12","1.2.13","1.2.14","1.2.15","1.2.16","1.2.17","1.2.18","1.2.19","1.2.2","1.2.3","1.2.4","1.2.5","1.2.6","1.2.7","1.2.8","1.2.9","1.3.0","1.3.1","1.3.2","1.3.3","1.3.4","1.3.5","1.3.6","2.0","2.0.1","2.0.2","2.0.3","2.0.4","2.0.5","3.0.0","3.0.1","4.0.0","4.0.1","4.0.2","4.0.3","4.0.4","4.0.5","4.0.6","4.1.0","4.1.1","4.1.2","4.1.3","4.1.4","4.1.5"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/plone-app-theming/PYSEC-2026-2885.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"}]}