CVE-2026-42551
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductFlightphp/core
PublishedMay 13, 2026
First seenMay 13, 2026
Weakness typeCWE-436CWE-436
How to fix
Update
- flightphp/core3.18.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| flightphp/corePackagist | v < 3.18.1 | 3.18.1 |
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