{"api_version":"1","generated_at":"2026-04-17T01:44:16+00:00","cve":"CVE-2021-21264","urls":{"html":"https://cve.report/CVE-2021-21264","api":"https://cve.report/api/cve/CVE-2021-21264.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-21264","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-21264"},"summary":{"title":"CVE-2021-21264","description":"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. 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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."}]},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"LOW","baseScore":5.2,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"HIGH","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-862 Missing Authorization"}]}]},"references":{"reference_data":[{"name":"https://github.com/octobercms/october/security/advisories/GHSA-fcr8-6q7r-m4wg","refsource":"CONFIRM","url":"https://github.com/octobercms/october/security/advisories/GHSA-fcr8-6q7r-m4wg"}]},"source":{"advisory":"GHSA-fcr8-6q7r-m4wg","discovery":"UNKNOWN"}},"nvd":{"publishedDate":"2021-05-03 16:15:00","lastModifiedDate":"2022-10-19 19:04:00","problem_types":["NVD-CWE-Other"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"LOW","baseScore":5.2,"baseSeverity":"MEDIUM"},"exploitabilityScore":1.1,"impactScore":3.7},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:L/AC:M/Au:N/C:P/I:P/A:P","accessVector":"LOCAL","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL","baseScore":4.4},"severity":"MEDIUM","exploitabilityScore":3.4,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:*","versionEndIncluding":"1.0.471","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:*","versionStartIncluding":"1.1.0","versionEndIncluding":"1.1.1","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"21264","Ordinal":"195390","Title":"CVE-2021-21264","CVE":"CVE-2021-21264","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"21264","Ordinal":"1","NoteData":"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.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"21264","Ordinal":"2","NoteData":"2021-05-03","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"21264","Ordinal":"3","NoteData":"2021-05-03","Type":"Other","Title":"Modified"}]}}}