CVE-2026-108652 [MEDIUM] – JeecgBoot through 3.9.5 contains a missing authorization vulnerability in the SystemApiCon

JeecgBoot through 3.9.5 contains a missing authorization vulnerability in the SystemApiController updateAvatar handler that allows any authenticated user to change other users’ avatars. Low-privileged attackers can send PUT requests with a target user id and an arbitrary value, such as an attacker-controlled image URL, to replace administrators’ avatars.