{"id":"CVE-2026-46636","state":"PUBLISHED","title":"Twig: Sandbox method allowlist bypass via `Markup` subclass","description":"Twig is a template language for PHP. From version 1.0.0 to before version 3.27.0, SecurityPolicy::checkMethodAllowed() unconditionally whitelists all method calls on instances of Twig\\Markup. Twig\\Markup is not final, so subclasses inherit the bypass. An application that passes an object of a Markup-derived class into a sandboxed template (typically to mark a chunk of HTML as safe) inadvertently exposes every public method of that subclass to template authors, regardless of the configured allowedMethods list. This issue has been patched in version 3.27.0.","publishedAt":"2026-09-04T22:07:35.122Z","updatedAt":"2026-09-08T17:38:45.651Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["twigphp Twig"],"affected":[{"vendor":"twigphp","product":"Twig","versions":[{"version":">= 1.0.0, < 3.27.0","status":"affected"}]}],"references":["https://github.com/twigphp/Twig/security/advisories/GHSA-64jr-qjx4-w2fh","https://security-tracker.debian.org/tracker/CVE-2026-46636","https://security-tracker.debian.org/tracker/DSA-6311-1","https://symfony.com/blog/cve-2026-46636-sandbox-filter-tag-and-function-allow-list-bypass-when-sandbox-state-changes-between-renders","http://github.com/twigphp/Twig/releases/tag/v3.27.0"],"weaknesses":["CWE-1336"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46636.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46636","state":"PUBLISHED","datePublished":"2026-09-04T22:07:35.122Z","dateUpdated":"2026-09-08T17:38:45.651Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-15T20:11:54.584Z"},"containers":{"cna":{"title":"Twig: Sandbox method allowlist bypass via `Markup` subclass","descriptions":[{"lang":"en","value":"Twig is a template language for PHP. From version 1.0.0 to before version 3.27.0, SecurityPolicy::checkMethodAllowed() unconditionally whitelists all method calls on instances of Twig\\Markup. Twig\\Markup is not final, so subclasses inherit the bypass. An application that passes an object of a Markup-derived class into a sandboxed template (typically to mark a chunk of HTML as safe) inadvertently exposes every public method of that subclass to template authors, regardless of the configured allowedMethods list. This issue has been patched in version 3.27.0."}],"affected":[{"vendor":"twigphp","product":"Twig","versions":[{"version":">= 1.0.0, < 3.27.0","status":"affected"}]}],"references":[{"url":"https://github.com/twigphp/Twig/security/advisories/GHSA-64jr-qjx4-w2fh","name":"https://github.com/twigphp/Twig/security/advisories/GHSA-64jr-qjx4-w2fh","tags":["x_refsource_CONFIRM"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-46636","name":"https://security-tracker.debian.org/tracker/CVE-2026-46636","tags":["x_refsource_MISC"]},{"url":"https://security-tracker.debian.org/tracker/DSA-6311-1","name":"https://security-tracker.debian.org/tracker/DSA-6311-1","tags":["x_refsource_MISC"]},{"url":"https://symfony.com/blog/cve-2026-46636-sandbox-filter-tag-and-function-allow-list-bypass-when-sandbox-state-changes-between-renders","name":"https://symfony.com/blog/cve-2026-46636-sandbox-filter-tag-and-function-allow-list-bypass-when-sandbox-state-changes-between-renders","tags":["x_refsource_MISC"]},{"url":"http://github.com/twigphp/Twig/releases/tag/v3.27.0","name":"http://github.com/twigphp/Twig/releases/tag/v3.27.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1336","lang":"en","description":"CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-04T22:07:35.122Z"},"source":{"advisory":"GHSA-64jr-qjx4-w2fh","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-08T17:37:04.193009Z","id":"CVE-2026-46636","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-08T17:38:45.651Z"}}]}}}