Authentication bypass vulnerability in a-blog cms Ver.2.8.x series versions prior to Ver.2.8.74 Ver.2.9.x series versions prior to Ver.2.9.39 Ver.2.10.x series versions prior to Ver.2.10.43 and Ver.2.11.x series versions prior to Ver.2.11.41 allows a remote unauthenticated attacker to bypass authentication under the specific condition.