{"id":"CVE-2021-21264","details":"October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. A bypass of CVE-2020-26231 (fixed in 1.0.470/471 and 1.1.1) was discovered that has the same impact as CVE-2020-26231 & CVE-2020-15247. An 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. This 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. Issue has been patched in Build 472 (v1.0.472) and v1.1.2. As a workaround, apply https://github.com/octobercms/october/commit/f63519ff1e8d375df30deba63156a2fc97aa9ee7 to your installation manually if unable to upgrade to Build 472 or v1.1.2.","aliases":["GHSA-fcr8-6q7r-m4wg"],"modified":"2026-09-14T08:12:53.474956Z","published":"2021-05-03T16:15:07.510Z","references":[{"type":"FIX","url":"https://github.com/octobercms/october/security/advisories/GHSA-fcr8-6q7r-m4wg"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/octobercms/october","events":[{"introduced":"0"},{"last_affected":"7ecf05138263e8aff3bb8913e270976405704b69"},{"introduced":"f9706d69924b6a9e492c44537e1745d5c46eccbf"},{"last_affected":"d5a93e3b61c6587828b52ad81ad100cbf6459f9c"}],"database_specific":{"source":"CPE_RANGE","cpe":"cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"last_affected":"1.0.471"},{"introduced":"1.1.0"},{"last_affected":"1.1.1"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21264.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L"}]}