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CVE-2026-73056— SiYuan kernel before 3.7.4 Unthrottled Brute-Force via API Token

Quick assessment

Affected
siyuan-note siyuan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiYuan是SiYuan团队开源的一款文档管理软件。 SiYuan 3.7.4之前版本存在授权问题漏洞，该漏洞源于CheckAuth()中间件对过多认证尝试限制不当，允许未认证远程攻击者无限自动猜测API令牌，成功后获得完全管理员权限，可执行任意文件操作和SQL查询。

CVSS 9.8 · Critical EPSS 0.45% · P38

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.7.4 affected
3.7.4 unaffected
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I. Basic Information for CVE-2026-73056

Vulnerability Information
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Vulnerability Title
SiYuan kernel before 3.7.4 Unthrottled Brute-Force via API Token
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
过多认证尝试的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan团队开源的一款文档管理软件。 SiYuan 3.7.4之前版本存在授权问题漏洞，该漏洞源于CheckAuth()中间件对过多认证尝试限制不当，允许未认证远程攻击者无限自动猜测API令牌，成功后获得完全管理员权限，可执行任意文件操作和SQL查询。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan 0 ~ 3.7.4 -

II. Public POCs for CVE-2026-73056

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III. Intelligence Information for CVE-2026-73056

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Vendor Advisories for CVE-2026-73056 (2)

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-307

V. Comments for CVE-2026-73056

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