CVE-2025-66303

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Prior to 1.8.0-beta.27, A Denial of Service (DoS) vulnerability has been identified in Grav related to the handling of scheduled_at parameters. Specifically, the application fails to properly sanitize input for cron expressions. By manipulating the scheduled_at parameter with a malicious input, such as a single quote, the application admin panel becomes non-functional, causing significant disruptions to administrative operations. The only way to recover from this issue is to manually access the host server and modify the backup.yaml file to correct the corrupted cron expression. 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, se ha identificado una vulnerabilidad de denegaci\u00f3n de servicio (DoS) en Grav relacionada con el manejo de los par\u00e1metros 'scheduled_at'. Espec\u00edficamente, la aplicaci\u00f3n no logra sanear correctamente la entrada para las expresiones cron. Al manipular el par\u00e1metro 'scheduled_at' con una entrada maliciosa, como una comilla simple, el panel de administraci\u00f3n de la aplicaci\u00f3n deja de funcionar, causando interrupciones significativas en las operaciones administrativas. La \u00fanica forma de recuperarse de este problema es acceder manualmente al servidor host y modificar el archivo 'backup.yaml' para corregir la expresi\u00f3n cron corrupta. Esta vulnerabilidad se corrige en 1.8.0-beta.27."}], "id": "CVE-2025-66303", "lastModified": "2026-09-26T00:10:00.127", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 4.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-66303", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-12-03T15:10:29.097271Z", "version": "2.0.3"}}]}, "published": "2025-12-01T22:15:49.913", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/getgrav/grav/commit/9d11094e4133f059688fad1e00dbe96fb6e3ead7"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/getgrav/grav/security/advisories/GHSA-x62q-p736-3997"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/getgrav/grav/security/advisories/GHSA-x62q-p736-3997"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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