IBM i 7.3, 7.4, 7.5, and 7.6 could allow an unathenticated remote attacker to bypass security restrictions due to improper access control. By sending a specially crafted HTTP request to any URL within the Navigator application prior to authentication, a bad actor could exploit this vulnerability to alter server-side session security state.
IBM i Release5770-SS1 Option 3
PTF Number(s)PTF Download Link(s)7.6SJ11740 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11740 7.5SJ11745 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11745 7.4SJ11746 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11746 7.3SJ11747 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11747
IBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products.