CVE-2026-42551
Flight: HTTP method override enabled by default enables CSRF escalation and middleware bypass in flightphp/core
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-436 |
| Vendor | flightphp |
| Product | core |
| Published | May 13, 2026 |
Stay Ahead of the Next One
Get instant alerts for flightphp core
Be the first to know when new high vulnerabilities affecting flightphp core are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Affected Versions
flightphp / core
< 3.18.1