{"id":"CVE-2026-42551","summary":"Flight: HTTP method override enabled by default enables CSRF escalation and middleware bypass in flightphp/core","details":"Flight is an extensible micro-framework for PHP. Prior to 3.18.1, Request::getMethod() unconditionally honors the X-HTTP-Method-Override header and the $_REQUEST['_method'] parameter on any HTTP verb (including safe verbs such as GET), with no opt-in and no whitelist of permitted target methods. A GET request can silently become a DELETE or PUT, enabling CSRF escalation against destructive endpoints, bypass of middleware gated on unsafe verbs, and cache poisoning between CDN and origin. This vulnerability is fixed in 3.18.1.","aliases":["GHSA-vxrr-w42w-w76g"],"modified":"2026-07-15T01:48:49.875520496Z","published":"2026-05-13T19:23:27.314Z","database_specific":{"cwe_ids":["CWE-436"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42551.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42551.json"},{"type":"ADVISORY","url":"https://github.com/flightphp/core/security/advisories/GHSA-vxrr-w42w-w76g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42551"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/flightphp/core","events":[{"introduced":"0"},{"fixed":"b8dd23aaa828cb289fa3c84e75b2a3717cab50b0"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"3.18.1"}],"source":"AFFECTED_FIELD"}}],"versions":["v3.18.0","v3.17.4","v3.17.3","v3.17.2","v3.17.1","v3.17.0","v3.16.1","v3.16.0","v3.15.3","v3.15.2","v3.15.1","v3.15.0","v3.14.0","v3.13.1","v3.13.0","v3.12.0","v3.11.1","v3.11.0","v3.10.1","v3.10.0","v3.9.0","v3.8.1","v3.8.0","v3.7.2","v3.7.1","v3.7.0","v3.6.2","v3.6.1","v3.6.0","v3.5.3","v3.5.2","v3.5.0","v3.4.2","v3.4.1","v3.4.0","v3.3.0","v3.2.0","v3.1.1","v3.1.0","v3.0.2","v3.0.1","v3.0.0","v2.0.1","v2.0.0","v1.3.9","v1.3.8","v1.3.7","v1.3.5","v1.3.4","v1.3.3","v1.3.2","v1.3.1","v1.3.0","v1.2.22","v1.2.21","v1.2.20","v1.2.19","v1.2.18","v1.2.17","v1.2.15","v1.2.14","v1.2.13","v1.2","v1.1.10","v1.1.5","v1.1","v1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42551.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}