High severity7.5GHSA Advisory· Published May 13, 2026· Updated May 14, 2026
CVE-2026-42551
CVE-2026-42551
Description
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
flightphp/corePackagist | < 3.18.1 | 3.18.1 |
Affected products
2Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-vxrr-w42w-w76gghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-42551ghsaADVISORY
- github.com/flightphp/core/commit/b8dd23aaa828cb289fa3c84e75b2a3717cab50b0ghsaWEB
- github.com/flightphp/core/releases/tag/v3.18.1ghsaWEB
- github.com/flightphp/core/security/advisories/GHSA-vxrr-w42w-w76gnvdWEB
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