What is CVE-2026-42551?

CVE-2026-42551 is a high-severity vulnerability in Flightphp Core, classified under CWE-436. CVSS score: 7.5/10. Published 2026-05-13.

How severe is CVE-2026-42551?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Flightphp Core

CVE-2026-42551

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), wit…

EPSS: 0.000 (1.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Flightphp Core — versions < 3.18.1

Weakness classification (CWE)

CWE-436

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-42551?: CVE-2026-42551 is a high-severity vulnerability in Flightphp Core, classified under CWE-436. CVSS score: 7.5/10. Published 2026-05-13.
How severe is CVE-2026-42551?: High severity. CVSS v3 base score is 7.5 out of 10.