Vulnerability Description
SiYuan kernel versions before 3.7.4 contain an improper restriction of excessive authentication attempts vulnerability in the CheckAuth() middleware. The middleware accepts the API token (Conf.Api.Token) via an Authorization header (Token/Bearer) or a ?token= query parameter, and neither path is protected by the application's CAPTCHA/lockout mechanism (NeedCaptcha/WrongAuthCount). As a result, an unauthenticated remote attacker can perform unlimited automated guesses of the API token, particularly when a short or weak custom token has been configured, and upon success gains full RoleAdministrator access enabling arbitrary file operations and SQL queries.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-m6w6-p7pc-fpg2
- https://www.vulncheck.com/advisories/siyuan-kernel-before-unthrottled-brute-forc
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-m6w6-p7pc-fpg2
FAQ
What is CVE-2026-73056?
CVE-2026-73056 is a vulnerability with a CVSS score of 9.8 (CRITICAL). SiYuan kernel versions before 3.7.4 contain an improper restriction of excessive authentication attempts vulnerability in the CheckAuth() middleware. The middleware accepts the API token (Conf.Api.Tok...
How severe is CVE-2026-73056?
CVE-2026-73056 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-73056?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.