{"id":"CVE-2026-61457","summary":"Grav before 1.0.3 Remote Code Execution via File Upload Extension Bypass","details":"The Grav API plugin (getgrav/grav-plugin-api) before 1.0.3 contains a file upload extension bypass in the API media controller. HandlesMediaUploads::validateFileExtension() inspects only the final file extension via pathinfo($filename, PATHINFO_EXTENSION), so a user with api.media.write permission can upload a file with a double extension such as shell.php.jpg to bypass the dangerous extensions blocklist. The web server may then execute the file as PHP, resulting in remote code execution.","aliases":["GHSA-66v2-vxxf-xc3v"],"modified":"2026-07-17T03:48:17.489464053Z","published":"2026-07-15T11:25:46.519Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-434"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61457.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61457.json"},{"type":"ADVISORY","url":"https://github.com/getgrav/grav/security/advisories/GHSA-66v2-vxxf-xc3v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61457"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/grav-before-remote-code-execution-via-file-upload-extension-bypass"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/getgrav/grav","events":[{"introduced":"0"},{"fixed":"4a5a400b89f38244bf4c958242c557309527bedd"}],"database_specific":{"source":["AFFECTED_FIELD","DESCRIPTION"],"extracted_events":[{"introduced":"0"},{"fixed":"1.0.3"}]}}],"versions":["1.0.2","1.0.1","1.0.0","1.0.0-rc.6","1.0.0-rc.5","1.0.0-rc.4","1.0.0-rc.3","1.0.0-rc.2","1.0.0-rc.1","0.9.45","0.9.44","0.9.43","0.9.42","0.9.41","0.9.40","0.9.39","0.9.38","0.9.37","0.9.36","0.9.35","0.9.34","0.9.33","0.9.32","0.9.31","0.9.30","0.9.29","0.9.28","0.9.27","0.9.26","0.9.25","0.9.24","0.9.23","0.9.22","0.9.21","0.9.20","0.9.19","0.9.18","0.9.17","0.9.16","0.9.15","0.9.14","0.9.13","0.9.12","0.9.11","0.9.10","0.9.9","0.9.8","0.9.7","0.9.6","0.9.5","0.9.4","0.9.3","0.9.2","0.9.0","0.8.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61457.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"}]}