Cyber Posture

CVE-2026-42551

High

Published: 13 May 2026

Published
13 May 2026
Modified
14 May 2026
KEV Added
—
Patch
—
CVSS Score 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS Score 0.0003 8.4th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-42551 is a high-severity Interpretation Conflict (CWE-436) vulnerability. Its CVSS base score is 7.5 (High).

Operationally, ranked at the 8.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

NVD 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.…

more

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.

Deeper analysisAI

Automated synthesis unavailable for this CVE.

Details

CWE(s)
CWE-436

References