CVE-2026-74802

HIGH 8.2

SiYuan 3.7.3 Cross-Site WebSocket Hijacking via network proxy

CVSS Score

8.2

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-346
Vendor	siyuan-note
Product	siyuan
Published	Aug 17, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

Low

Availability

None

Affected Versions

siyuan-note / siyuan

0 < 3.7.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-3cc2-h3v6-rqpq vulncheck.com: https://www.vulncheck.com/advisories/siyuan-cross-site-websocket-hijacking-via-network-proxy

Credits

🔍 alham-rizvi