{"id":"CVE-2020-15247","aliases":["GHSA-94vp-rmqv-5875"],"url":"https://o3.security/vulnerability/CVE-2020-15247","summary":"Twig Sandbox Escape by authenticated users with access to editing CMS templates when safemode is enabled.","details":"### Impact\nAn authenticated backend user with the `cms.manage_pages`, `cms.manage_layouts`, or `cms.manage_partials` permissions who would **normally** not be permitted to provide PHP code to be executed by the CMS due to `cms.enableSafeMode` being enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP.\n\nThis is not a problem for anyone that trusts their users with those permissions to normally write & manage PHP within the CMS by not having `cms.enableSafeMode` enabled, but would be a problem for anyone relying on `cms.enableSafeMode` to ensure that users with those permissions in production do not have access to write & execute arbitrary PHP.\n\n### Patches\nIssue has been patched in Build 469 (v1.0.469) and v1.1.0.\n\n### Workarounds\nApply https://github.com/octobercms/october/compare/106daa2930de4cebb18732732d47d4056f01dd5b...7cb148c1677373ac30ccfd3069d18098e403e1ca to your installation manually if unable to upgrade to Build 469.\n\n### References\nReported by [ka1n4t](https://github.com/ka1n4t)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Email us at [hello@octobercms.com](mailto:hello@octobercms.com)\n\n### Threat assessment:\n<img width=\"1108\" alt=\"Screen Shot 2020-10-10 at 1 21 13 PM\" src=\"https://user-images.githubusercontent.com/7253840/95663316-7de28b80-0afb-11eb-999d-a6526cf78709.png\">","published":"2020-11-23T20:15:12.383Z","modified":"2026-08-07T15:11:48.374733Z","cvss":{"score":5.2,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L"},"epss":{"score":0.0029,"percentile":0.21323,"asOf":"2026-08-11"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"october/cms","fixedVersion":"1.0.469"}],"fix":{"url":"https://github.com/octobercms/october/commit/4c650bb775ab849e48202a4923bac93bd74f9982","label":"octobercms/october@4c650bb"},"references":[{"type":"ADVISORY","url":"https://github.com/octobercms/october/security/advisories/GHSA-94vp-rmqv-5875"},{"type":"FIX","url":"https://github.com/octobercms/october/commit/4c650bb775ab849e48202a4923bac93bd74f9982"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-15247"},{"type":"PACKAGE","url":"https://github.com/octobercms/october"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T15:11:48.374733Z"}}