CVE-2025-66299

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Prior to 1.8.0-beta.27, Grav CMS is vulnerable to a Server-Side Template Injection (SSTI) that allows any authenticated user with editor permissions to execute arbitrary code on the remote server, bypassing the existing security sandbox. Since the security sandbox does not fully protect the Twig object, it is possible to interact with it (e.g., call methods, read/write attributes) through maliciously crafted Twig template directives injected into a web page. This allows an authenticated editor to add arbitrary functions to the Twig attribute system.twig.safe_filters, effectively bypassing the Grav CMS sandbox. This vulnerability is fixed in 1.8.0-beta.27."}, {"lang": "es", "value": "Grav es una plataforma web basada en archivos. Versiones anteriores a 1.8.0-beta.27, Grav CMS es vulnerable a una inyecci\u00f3n de plantilla del lado del servidor (SSTI) que permite a cualquier usuario autenticado con permisos de editor ejecutar c\u00f3digo arbitrario en el servidor remoto, eludiendo la sandbox de seguridad existente. Dado que la sandbox de seguridad no protege completamente el objeto Twig, es posible interactuar con \u00e9l (p. ej., llamar a m\u00e9todos, leer/escribir atributos) a trav\u00e9s de directivas de plantilla Twig creadas maliciosamente e inyectadas en una p\u00e1gina web. Esto permite a un editor autenticado a\u00f1adir funciones arbitrarias al atributo Twig 'system.twig.safe_filters', eludiendo eficazmente la sandbox de Grav CMS. Esta vulnerabilidad se ha corregido en la versi\u00f3n 1.8.0-beta.27."}], "id": "CVE-2025-66299", "lastModified": "2026-09-26T00:10:00.127", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-66299", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-12-02T14:07:46.404721Z", "version": "2.0.3"}}]}, "published": "2025-12-01T22:15:49.290", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/getgrav/grav/commit/e37259527d9c1deb6200f8967197a9fa587c6458"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/getgrav/grav/security/advisories/GHSA-gjc5-8cfh-653x"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-94"}, {"lang": "en", "value": "CWE-1336"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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