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CVE-2026-42551— Flight: HTTP method override enabled by default enables CSRF escalation and middleware bypass in flightphp/core

Quick assessment

Affected
flightphp core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Flight是Mike Cao个人开发者的一个PHP微框架。 Flight 3.18.1之前版本存在安全漏洞，该漏洞源于Request::getMethod()无条件接受X-HTTP-Method-Override标头和$_REQUEST[ _method ]参数，可能导致CSRF升级、中间件绕过和缓存投毒。

CVSS 7.5 · High EPSS 0.41% · P33

Affected Version Matrix 1

VendorProduct Version RangeStatus
flightphp core < 3.18.1 affected
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I. Basic Information for CVE-2026-42551

Vulnerability Information
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Vulnerability Title
Flight: HTTP method override enabled by default enables CSRF escalation and middleware bypass in flightphp/core
Source: CVE Program / CVE List V5
Vulnerability 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 $_REQUEST['_method'] parameter on any HTTP verb (including safe verbs such as GET), with no opt-in and no whitelist of permitted target methods. A GET request can silently become a DELETE or PUT, enabling CSRF escalation against destructive endpoints, bypass of middleware gated on unsafe verbs, and cache poisoning between CDN and origin. This vulnerability is fixed in 3.18.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
解释冲突
Source: CVE Program / CVE List V5
Vulnerability Title
Flight 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Flight是Mike Cao个人开发者的一个PHP微框架。 Flight 3.18.1之前版本存在安全漏洞，该漏洞源于Request::getMethod()无条件接受X-HTTP-Method-Override标头和$_REQUEST[ _method ]参数，可能导致CSRF升级、中间件绕过和缓存投毒。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
flightphp core < 3.18.1 -

II. Public POCs for CVE-2026-42551

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III. Intelligence Information for CVE-2026-42551

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Vendor Advisories for CVE-2026-42551 (1)

Same Patch Batch · flightphp · 2026-05-13 · 5 CVEs total

CVE-2026-42550 8.8 HIGH Flight: SQL Injection via unvalidated identifiers in SimplePdo::insert / update / delete
CVE-2026-42552 7.5 HIGH Flight: Sensitive information disclosure via default error handler in flightphp/core
CVE-2026-42549 4.4 MEDIUM Flight: Path traversal in `make:controller` CLI creates arbitrary directories outside proj
CVE-2026-42548 Flight: Reflected XSS via unvalidated JSONP callback in Flight::jsonp()

IV. Related Vulnerabilities

Same product: core
Same vendor: flightphp
Same weakness: CWE-436

V. Comments for CVE-2026-42551

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