The vulnerability exists in the 'Evaluations' function within the datasets section, where the 'id' parameter is user-controlled. This allows an attacker to update prompts belonging to other users by changing the 'id' value in the request. The lack of proper access control checks on the 'id' parameter leads to an Insecure Direct Object Reference (IDOR) vulnerability.

An attacker logs in as User A and intercepts the request to update a prompt. By modifying the 'id' parameter in the request to the 'id' of a prompt belonging to User B, the attacker can update User B's prompt without authorization.

Users of version 1.3.2 who utilize the 'Evaluations' function in the datasets section are affected. This includes any user who has prompts that could be updated by unauthorized users.