FlyCms through commit edfdf724 contains a default credentials vulnerability that allows unauthenticated remote attackers to gain super administrator access via the flycms account with password admin123. Attackers can log in through POST /api/auth/login, solving only the image captcha, to obtain full control of site content, users and configuration.

FlyCms through commit edfdf724 contains a mass assignment vulnerability that allows authenticated users to overwrite protected account columns by submitting extra User bean fields to /ucenter/accountupdate. Attackers can change their review status, rename themselves, or duplicate another account's username, email or mobile to break that victim's login.

FlyCms through commit edfdf724 contains a missing authorization vulnerability in ActionService.counter() that allows authenticated users to modify other users' content rows because checkRowOwner never verifies ownership. Any registered user can send requests to /ucenter/action/{modelCode}/{id}/counter or /ucenter/action/compose to add arbitrary deltas to numeric fields like price, stock, or points.