CVE-2021-26600

CVE-2021-26600 is a critical authentication bypass vulnerability affecting ImpressCMS versions prior to 1.4.3. It stems from a type confusion error in the autologin.php preload script, allowing attackers to bypass authentication mechanisms. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with no user interaction, leading to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code, the vulnerability has garnered significant community discussion, indicating awareness among security researchers.