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CVE-2026-73054— SiYuan before v3.7.4 Authentication Bypass via WebSocket

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WebSocket端点中查询参数在认证豁免和会话隔离检查之间的差异解析，可能导致未经身份验证的攻击者构造恶意WebSocket URI，通过重复查询参数绕过访问认证码验证，接收实时内核事件流，包括文档标识符、标题和操作日志。

CVSS 7.5 · High EPSS 0.54% · P44

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-2026-73054

Vulnerability Information
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Vulnerability Title
SiYuan before v3.7.4 Authentication Bypass via WebSocket
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan versions before v3.7.4 contain an authentication bypass vulnerability in the WebSocket endpoint caused by differential parsing of query parameters between authentication exemption and session quarantine checks. Unauthenticated attackers can craft a malicious WebSocket URI with duplicated query parameters to bypass access auth code validation and receive the live kernel event stream including document identifiers, titles, and operation logs.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
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WebSocket端点中查询参数在认证豁免和会话隔离检查之间的差异解析，可能导致未经身份验证的攻击者构造恶意WebSocket URI，通过重复查询参数绕过访问认证码验证，接收实时内核事件流，包括文档标识符、标题和操作日志。
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-2026-73054

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III. Intelligence Information for CVE-2026-73054

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Vendor Advisories for CVE-2026-73054 (2)

Same Patch Batch · siyuan-note · 2026-08-15 · 11 CVEs total

CVE-2026-73046 9.8 CRITICAL SiYuan before v3.7.4 Authentication Bypass via HTTP Basic Auth
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-2026-73047 6.2 MEDIUM siyuan before v3.7.4 Server-Side Template Injection via attribute-view

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-287

V. Comments for CVE-2026-73054

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