mtnpeak.net File Upload Manager does not properly check user authentication for certain actions, which allows remote attackers to provide a modified base64-encoded file parameter and (1) read arbitrary files via the "view" action or (2) delete arbitrary files via the del action.
CWE-287 - Improper Authentication
Improper (or broken) authentication attacks are widespread, and have accounted for many of the worst data breaches in recent years. Improper authentication attacks are a class of vulnerabilities where an attacker impersonates a legitimate user by exploiting weaknesses in either session management or credential management to gain access to the user’s account. This can result in disclosure of sensitive information, and can lead to system compromise, theft, identity theft, and fraud.