cpie.php in XCMS 1.83 and earlier sends a redirect to the web browser but does not exit, which allows remote attackers to conduct direct static code injection attacks and execute arbitrary code via the testo_0 parameter in a cpie admin action to index.php, which writes to dati/generali/footer.dtb (aka the XCMS footer).
Improper Control of Generation of Code The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.