CVE-2026-55573 e107: Unsafe deserialization in install.php allows unauthenticated RCE via POP chain

e107 is a content management system CMS. Prior to 2.3.7, install.php decodes the attacker-controlled previoussteps POST parameter and passes it to unserialize at file scope and again in the einstall constructor without restricting allowed classes. The installer remains accessible after a normal...