TI-2026-30831 Aliases CVE-2026-42551 GHSA-vxrr-w42w-w76g

Flight: HTTP method override enabled by default enables CSRF escalation and middleware bypass in flightphp/core

HIGH 72CWE-436Published 2026-05-13 · Updated 2026-05-14

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00351 28th percentileScored 2026-11-07

Fix Fixed core (flightphp): 3.18.1flightphp/core (Packagist): 3.18.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
flightphp	core	before 3.18.1	3.18.1	Patch available	CNA
—	flightphp/core (Packagist)	before 3.18.1	3.18.1	Patch available	GHSA-vxrr-w42w-w76g

core Vendorflightphp Affected before 3.18.1 Fixed in 3.18.1 Patch available CNA
flightphp/core (Packagist) Vendor— Affected before 3.18.1 Fixed in 3.18.1 Patch available GHSA-vxrr-w42w-w76g

Remediation

Fix · CNA core (flightphp) Fixed in 3.18.1
Fix · GHSA-vxrr-w42w-w76g flightphp/core (Packagist) Fixed in 3.18.1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-42551
2026-10-03 Alias added: GHSA-vxrr-w42w-w76g

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-42551

Other 4

TI-2026-30828 Flight: Reflected XSS via unvalidated JSONP callback in Flight::jsonp() CVSS 4.0HIGH 8.6
TI-2026-30830 Flight: SQL Injection via unvalidated identifiers in SimplePdo::insert / update / delete CVSS 3.1HIGH 8.8
TI-2026-30832 Flight: Sensitive information disclosure via default error handler in flightphp/core CVSS 3.1HIGH 7.5
TI-2014-08426 Denial of Service (DoS) vulnerability in mikecao/flight CVSS 3.1HIGH 7.5
TI-2026-30829 Flight: Path traversal in `make:controller` CLI creates arbitrary directories outside project root CVSS 3.1MEDIUM 4.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences