CVE-2026-91819 MISP: HTTP Method Override Bypasses CSRF and Form Validation in BetterSecurityComponent

Affected versions of MISP rely on CakePHP request-method override processing in a way that can disable CSRF and form-security validation. CakePHP honors a method field or X-HTTP-Method-Override header by rewriting the effective request method. For override values outside the normal write verbs...

CVE-2026-91819

MISP (versions ≤2.5.45) is vulnerable in its BetterSecurityComponent due to how it interacts with CakePHP's request-method override processing. When an override value outside the normal write verbs (POST, PUT, PATCH, DELETE) is supplied — for example _method=GET — CakePHP clears the parsed reques...