SiYuan: Cross-Site WebSocket Hijacking on the admin-only network proxy endpoint (`/ws/network/proxy`) via explicit `CheckOrigin: true` bypass

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official 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.

[ Fixes ]Fixes and patches

• github.com/siyuan-note/siyuan/kernel 0.0.0-20260803045322-cb67e0b4fab5Fixed version · GitHub Advisories · go package github.com/siyuan-note/siyuan/kernel: upgrade to 0.0.0-20260803045322-cb67e0b4fab5 or later (affected < 0.0.0-20260803045322-cb67e0b4fab5)

[ Packages ]Affected open-source packages

• github.com/siyuan-note/siyuan/kernel goAffected < 0.0.0-20260803045322-cb67e0b4fab5 · fixed in 0.0.0-20260803045322-cb67e0b4fab5 · GHSA-3cc2-h3v6-rqpq

[ References ]References

• github.com/siyuan-note/siyuan/security/advisories/GHSA-3cc2-h3v6-rqpqvendor-advisory
• www.vulncheck.com/advisories/siyuan-cross-site-websocket-hijacking-via-network-proxythird-party-advisory