CVE-2026-108875 JeecgBoot through 3.9.5 Missing Authorization via /sys/user/addSysUserGroup

JeecgBoot through 3.9.5 contains a missing authorization vulnerability in the SysUserController addSysUserGroup handler that allows any authenticated user to modify user group membership. Low-privileged attackers can send POST requests with arbitrary user ids and a groupId to add any users to...