{"apiVersion":"1.0","identifier":"CVE-2026-73056","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.","publishedAt":"2026-08-16T14:16:55","lastModifiedAt":"2026-08-26T17:04:11","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73056","cvssScore":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.0045,"riskScore":1.02,"affectedProduct":"SiYuan","affectedVersions":"<3.7.4","vulnerabilityType":"Web app","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-73056","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-73056","en":"https://www.redsauce.net/en/cves/CVE-2026-73056","fr":"https://www.redsauce.net/fr/cves/CVE-2026-73056","pt":"https://www.redsauce.net/pt/cves/CVE-2026-73056","de":"https://www.redsauce.net/de/cves/CVE-2026-73056","sk":"https://www.redsauce.net/sk/cves/CVE-2026-73056","el":"https://www.redsauce.net/el/cves/CVE-2026-73056"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-73056"}}