The vulnerability stems from improper access control mechanisms within the application, allowing unauthorized access to sensitive user data. By exploiting this vulnerability, an attacker can gain access to the chat histories of any user on the server. This could lead to data breaches, identity theft, and manipulation or fraud, as attackers could use the obtained information for malicious purposes. The impact of this vulnerability is significant, given the sensitive nature of chat histories, which may contain personal, financial, or confidential information.

An attacker, without needing any prior interaction with the victim, crafts a malicious request to the server hosting 'gaizhenbiao/chuanhuchatgpt'. By exploiting the improper access control vulnerability, the attacker can retrieve the chat history of any user. This scenario does not require the attacker to have any specific privileges or credentials, making it a critical security issue.

All users of the 'gaizhenbiao/chuanhuchatgpt' application version 20240410 are potentially affected by this vulnerability. This includes individuals and entities that rely on the application for private and confidential communications.