CVE-2026-73056
Critical · CVSS 9.3Published 2026-08-16
CVSS
9.3
Critical
EPSS
—
exploit probability
Active Exploit
No
not yet listed
What is CVE-2026-73056?
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 Explained
CVSS 9.3 is Critical — the highest severity tier. Attackers can likely exploit this remotely with no authentication and cause full system compromise. Patch immediately.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- ›https://github.com/siyuan-note/siyuan/security/advisories/GHSA-m6w6-p7pc-fpg2
- ›https://www.vulncheck.com/advisories/siyuan-kernel-before-unthrottled-brute-force-via-api-token
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