# CVE-2026-74802

## Summary

- **CVE ID:** CVE-2026-74802
- **Severity:** HIGH
- **CVSS Score:** 8.2 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:L/SI:L/SA:N)
- **CWE:** CWE-346
- **Published:** Aug 17, 2026
- **Last Modified:** Aug 28, 2026

## 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.

## Affected Products

- siyuan-note — siyuan (0)
- siyuan-note — siyuan (3.7.4)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.12%
- **EPSS Percentile:** 2.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._