high7.5
CVE-2026-42551
Flight: HTTP method override enabled by default, facilitating CSRF escalation and middleware bypass
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | flightphp/core | < 3.18.1 | 3.18.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-vxrr-w42w-w76g
- https://github.com/flightphp/core/security/advisories/GHSA-vxrr-w42w-w76g
- https://github.com/flightphp/core/commit/b8dd23aaa828cb289fa3c84e75b2a3717cab50b0
- https://github.com/flightphp/core/releases/tag/v3.18.1
- https://nvd.nist.gov/vuln/detail/CVE-2026-42551