CVE-2026-73046— SiYuan before v3.7.4 Authentication Bypass via HTTP Basic Auth
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()中间件未正确限制过多身份验证尝试，HTTP Basic认证分支接受工作空间访问码作为密码但不检查验证码/锁定门，也不增加失败计数器，且访问码比较使用非恒定时间字符串比较，可能导致未认证的远程攻击者暴力破解管理员访问码并获得完全管理员权限。
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1110.004 · Credential StuffingAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| siyuan-note | siyuan | < 3.7.4 |
affected |
3.7.4 |
unaffected |
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I. Basic Information for CVE-2026-73046
Vulnerability Information
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Vulnerability Title
SiYuan before v3.7.4 Authentication Bypass via HTTP Basic Auth
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan before v3.7.4 improperly restricts excessive authentication attempts in the CheckAuth() middleware. The HTTP Basic Authentication branch, which guards nearly the entire /api/* surface, accepts the workspace access code (Conf.AccessAuthCode) as the Basic Auth password but never consults the CAPTCHA/lockout gate or increments the failure counter used by the cookie/session login path. This allows unauthenticated remote attackers to brute-force the admin access code with unlimited automated requests and obtain full RoleAdministrator access to the kernel. A secondary weakness exists because the access code is compared using a non-constant-time string comparison.
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()中间件未正确限制过多身份验证尝试，HTTP Basic认证分支接受工作空间访问码作为密码但不检查验证码/锁定门，也不增加失败计数器，且访问码比较使用非恒定时间字符串比较，可能导致未认证的远程攻击者暴力破解管理员访问码并获得完全管理员权限。
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-2026-73046
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-73046 (2)
Same Patch Batch · siyuan-note · 2026-08-15 · 11 CVEs total
| CVE-2026-73050 | 9.0 CRITICAL | SiYuan before v3.7.4 Stored XSS via select option color |
| CVE-2026-73043 | 9.0 CRITICAL | SiYuan before v3.7.4 Remote Code Execution via Template Calculation |
| CVE-2026-73042 | 9.0 CRITICAL | SiYuan before v3.7.4 Remote Code Execution via Menu Metadata |
| CVE-2026-73041 | 9.0 CRITICAL | SiYuan before v3.7.4 Remote Code Execution via PDF Annotations |
| CVE-2026-73044 | 9.0 CRITICAL | SiYuan before v3.7.4 Stored Cross-Site Scripting via Column Width |
| CVE-2026-73053 | 9.0 CRITICAL | SiYuan before v3.7.4 Cross-Site Scripting via unicode2Emoji |
| CVE-2026-73052 | 9.0 CRITICAL | SiYuan before v3.7.4 Stored XSS via Attribute-View Field Names |
| CVE-2026-73045 | 7.5 HIGH | SiYuan before 3.7.4 Brute-Force via authFilePublishAccess |
| CVE-2026-73054 | 7.5 HIGH | SiYuan before v3.7.4 Authentication Bypass via WebSocket |
| CVE-2026-73047 | 6.2 MEDIUM | siyuan before v3.7.4 Server-Side Template Injection via attribute-view |
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V. Comments for CVE-2026-73046
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