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CVE-2026-74802— SiYuan 3.7.3 Cross-Site WebSocket Hijacking via network proxy

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之前版本存在输入验证错误漏洞，该漏洞源于/ws/network/proxy端点将CheckOrigin设置为无条件返回true以禁用来源验证，导致跨站WebSocket劫持。攻击者可构造恶意网页建立WebSocket连接，使SiYuan内核进程将任意网络流量代理至攻击者选择的目标，从而通过受害者机器实现已验证的网络跳板。

CVSS 8.2 · High EPSS 0.10% · P1

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-2026-74802

Vulnerability Information
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Vulnerability Title
SiYuan 3.7.3 Cross-Site WebSocket Hijacking via network proxy
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan versions before 3.7.4 contain a cross-site WebSocket hijacking vulnerability in the admin-only /ws/network/proxy endpoint that explicitly disables origin validation by setting CheckOrigin to unconditionally return true. Attackers can craft malicious webpages that establish WebSocket connections to this endpoint and direct the SiYuan kernel process to proxy arbitrary network traffic to attacker-chosen targets, enabling authenticated network pivoting through the victim's machine.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 输入验证错误漏洞
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之前版本存在输入验证错误漏洞，该漏洞源于/ws/network/proxy端点将CheckOrigin设置为无条件返回true以禁用来源验证，导致跨站WebSocket劫持。攻击者可构造恶意网页建立WebSocket连接，使SiYuan内核进程将任意网络流量代理至攻击者选择的目标，从而通过受害者机器实现已验证的网络跳板。
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-2026-74802

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III. Intelligence Information for CVE-2026-74802

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Vendor Advisories for CVE-2026-74802 (1)

News Coverage for CVE-2026-74802 (1)

Same Patch Batch · siyuan-note · 2026-08-17 · 7 CVEs total

CVE-2026-74799 9.3 CRITICAL SiYuan before 3.7.4 Unauthenticated Debug Endpoint Information Disclosure
CVE-2026-74800 9.0 CRITICAL SiYuan before v3.7.4 Stored XSS via assets endpoint
CVE-2026-74798 8.7 HIGH SiYuan kernel Path Traversal via database_clean MCP tool
CVE-2026-74801 8.2 HIGH SiYuan before 3.7.4 Local Privilege Escalation via elevator.exe
CVE-2026-74868 7.5 HIGH SiYuan before 3.7.4 Brute-Force Authentication via Publish Service
CVE-2026-74867 4.2 MEDIUM SiYuan before 3.7.4 Cross-Site Request Forgery via CheckAuth

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-346

V. Comments for CVE-2026-74802

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