CVE-2026-74802
High
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.
SeverityHigh
CVSS8.2
Exploit probability—
ProductGithub.com/siyuan-note/siyuan/kernel
PublishedAug 17, 2026
First seenAug 17, 2026
Weakness typeCWE-346CWE-346
How to fix
Update
- github.com/siyuan-note/siyuan/kernel0.0.0-20260803045322-cb67e0b4fab5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/siyuan-note/siyuan/kernelGo | v < 0.0.0-20260803045322-cb67e0b4fab5 | 0.0.0-20260803045322-cb67e0b4fab5 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.