CVE-2026-42551 — Flight: HTTP method override enabled by default enables CSRF escalation and middleware bypass in flightphp/core
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'] para…
Published: 2026-05-13 · CVSS: 7.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7