🛡️ CVE-2026-42551
🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-436 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE CWE-436
Public Exploit ✅ No
Source NVD
Published 2026-05-06
Updated 2026-06-02
Modified 2026-05-14
Fix URL N/A

Affected Packages

Software From version Fixed in
flightphp/core — 3.18.1
unknown — —

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