A vulnerability in the SiYuan Note publish service allows remote attackers to conduct brute-force authentication attacks, potentially leading to unauthorized access.

The application fails to properly restrict excessive authentication attempts, which can be exploited by unauthenticated remote attackers to guess credentials via the publish service.

By failing to limit login attempts, the application is susceptible to brute-force attacks that can lead to account takeover. With a CVSS score of 7.5, this vulnerability poses a significant risk to the security of user accounts and the confidentiality of stored data, as attackers can gain access through credential stuffing or rapid password guessing.

Immediate Action: Upgrade SiYuan Note to version 3.7.4 or later to implement the necessary authentication rate limiting.

Proactive Monitoring: Monitor login logs for high volumes of failed authentication attempts originating from single or distributed IP addresses.

Compensating Controls: Implement account lockout policies or temporary IP blocking at the network edge if the patch cannot be applied immediately.

Public Exploit Available: Unknown.

To mitigate the risk of unauthorized account access, administrators should update SiYuan Note to version 3.7.4 as soon as possible. This update introduces essential protections against brute-force attacks that are currently lacking in earlier versions.