{"id":"GHSA-vxwr-wpjv-qjq7","summary":"XWiki Platform: Privilege escalation (PR) from user registration through PDFClass","details":"### Impact\nRemote code execution is possible via PDF export templates.\nTo reproduce on an installation, register a new user account with username `PDFClass` if `XWiki.PDFClass` does not exist.\nOn `XWiki.PDFClass`, use the class editor to add a \"style\" property of type \"TextArea\" and content type \"Plain Text\".\nThen, add an object of class `PDFClass` and set the \"style\" attribute to `$services.logging.getLogger('PDFClass').error(\"I got programming: $services.security.authorization.hasAccess('programming')\")`.\nFinally, go to `\u003chost\u003e/xwiki/bin/export/Main/WebHome?format=pdf&pdftemplate=XWiki.PDFClass`. If the logs contain \"ERROR PDFClass - I got programming: true\", the instance is vulnerable.\n\n### Patches\nThis vulnerability has been patched in XWiki 14.10.20, 15.5.4 and 15.10-rc-1.\n\n### Workarounds\nIf PDF templates are not typically used on the instance, an administrator can create the document `XWiki.PDFClass` and block its edition, after making sure that it does not contain a `style` attribute.\nOtherwise, the instance needs to be updated.\n\n### References\n- https://jira.xwiki.org/browse/XWIKI-21337\n- https://github.com/xwiki/xwiki-platform/commit/d28e21a670c69880b951e415dd2ddd69d273eae9\n","aliases":["CVE-2024-31981"],"modified":"2026-09-10T03:50:00.424591927Z","published":"2024-04-10T17:11:45Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2024-04-10T17:11:45Z","nvd_published_at":"2024-04-10T20:15:08Z","cwe_ids":["CWE-862"],"severity":"CRITICAL"},"references":[{"type":"WEB","url":"https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-vxwr-wpjv-qjq7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-31981"},{"type":"WEB","url":"https://github.com/xwiki/xwiki-platform/commit/480186f9d2fca880513da8bc5a609674d106cbd3"},{"type":"WEB","url":"https://github.com/xwiki/xwiki-platform/commit/a4ad14d9c1605a5ab957237e505ebbb29f5b9d73"},{"type":"WEB","url":"https://github.com/xwiki/xwiki-platform/commit/d28e21a670c69880b951e415dd2ddd69d273eae9"},{"type":"PACKAGE","url":"https://github.com/xwiki/xwiki-platform"},{"type":"WEB","url":"https://jira.xwiki.org/browse/XWIKI-21337"}],"affected":[{"package":{"name":"org.xwiki.platform:xwiki-platform-oldcore","ecosystem":"Maven","purl":"pkg:maven/org.xwiki.platform/xwiki-platform-oldcore"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.1"},{"fixed":"14.10.20"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/04/GHSA-vxwr-wpjv-qjq7/GHSA-vxwr-wpjv-qjq7.json"}},{"package":{"name":"org.xwiki.platform:xwiki-platform-oldcore","ecosystem":"Maven","purl":"pkg:maven/org.xwiki.platform/xwiki-platform-oldcore"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"15.0-rc-1"},{"fixed":"15.5.4"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/04/GHSA-vxwr-wpjv-qjq7/GHSA-vxwr-wpjv-qjq7.json"}},{"package":{"name":"org.xwiki.platform:xwiki-platform-oldcore","ecosystem":"Maven","purl":"pkg:maven/org.xwiki.platform/xwiki-platform-oldcore"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"15.6-rc-1"},{"fixed":"15.10-rc-1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/04/GHSA-vxwr-wpjv-qjq7/GHSA-vxwr-wpjv-qjq7.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"}]}