Strapi through 4.5.5 allows attackers (with access to the admin panel) to discover sensitive user details by exploiting the query filter. The attacker can filter users by columns that contain sensitive information and infer a value from API responses. If the attacker has super admin access, then this can be exploited to discover the password hash and password reset token of all users. If the attacker has admin panel access to an account with permission to access the username and email of API users with a lower privileged role (e.g., Editor or Author), then this can be exploited to discover sensitive information for all API users but not other admin accounts.
An authenticated user with access to the Strapi admin panel can view private and sensitive data, such as email and password reset tokens, for API users if content types accessible to the authenticated user contain relationships to API users (from:users-permissions). There are many scenarios in which such details from API users can leak in the JSON response within the admin panel, either through a direct or indirect relationship. Access to this information enables a user to compromise these users’ accounts if the password reset API endpoints have been enabled. In a worst-case scenario, a low-privileged user could get access to a high-privileged API account, and could read and modify any data as well as block access to both the admin panel and API by revoking privileges for all other users.
Storing passwords in a recoverable format in the DOCUMENTATION plugin component of Strapi before 3.6.9 and 4.x before 4.1.5 allows an attacker to access a victim's HTTP request, get the victim's cookie, perform a base64 decode on the victim's cookie, and obtain a cleartext password, leading to getting API documentation for further API attacks.