Cross-site request forgery (CSRF) vulnerability on the Schneider Electric Quantum 140NOE77111, 140NOE77101, and 140NWM10000; M340 BMXNOC0401, BMXNOE0100x, and BMXNOE011xx; and Premium TSXETY4103, TSXETY5103, and TSXWMY100 PLC modules allows remote attackers to hijack the authentication of arbitrary users for requests that execute commands, as demonstrated by modifying HTTP credentials.