The advisory explicitly states form validation methods lack both permission checks and CSRF protections. In Jenkins plugin architecture, form validation handlers are typically methods named 'doCheck[FieldName]' in parameter definition classes. These methods would normally require POST requests (@RequirePOST annotation) and permission checks (Jenkins.get().checkPermission()). The absence of these protections in URL/property file validation handlers directly enables the described SSRF and CSRF vulnerabilities.