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.

• CWE-307

• 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
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-m6w6-p7pc-fpg2

Published

Aug 16, 2026

Last Modified

Aug 26, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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