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EUVD-2026-276782

fkie_cve-2026-32815

SiYuan is a personal knowledge management system. In versions 3.6.0 and below, the WebSocket endpoint (/ws) allows unauthenticated connections when specific URL parameters are provided (?app=siyuan&id=auth&type=auth). This bypass, intended for the login page to keep the kernel alive, allows any external client — including malicious websites via cross-origin WebSocket — to connect and receive all server push events in real-time. These events leak sensitive document metadata including document titles, notebook names, file paths, and all CRUD operations performed by authenticated users. Combined with the absence of Origin header validation, a malicious website can silently connect to a victim's local SiYuan instance and monitor their note-taking activity. This issue has been fixed in version 3.6.1.

GHSA-xp2m-98x8-rpj6 — SiYuan Vulnerable to Cross-Origin WebSocket Hijacking via Authentication Bypass — Unauthenticated Information Disclosure

Affected: Go: github.com/siyuan-note/siyuan/kernel

# Cross-Origin WebSocket Hijacking via Authentication Bypass — Unauthenticated Information Disclosure

## Summary

SiYuan's WebSocket endpoint (`/ws`) allows unauthenticated connections when specific URL parameters are provided (`?app=siyuan&id=auth&type=auth`). This bypass, intended for the login page to keep the kernel alive, allows any external client — including malicious websites via cross-origin WebSocket — to connect and receive all server push events in real-time. These events leak sensitive document metadata including document titles, notebook names, file paths, and all CRUD operations performed by authenticated users.

Combined with the absence of `Origin` header validation, a malicious website can silently connect to a victim's local SiYuan instance and monitor their note-taking activity.

## Affected Component

- **File:** `kernel/server/serve.go:728-731` - **Function:** `serveWebSocket()` → `HandleConnect` handler - **Endpoint:** `GET /ws?app=siyuan&id=auth&type=auth` (unauthenticated) - **Version:** SiYuan <= 3.5.9

## Root Cause

The WebSocket `HandleConnect` handler has a special case bypass (line 730) intended for the authorization page:

```go util.WebSocketServer.HandleConnect(func(s *melody.Session) { authOk := true if "" != model.Conf.AccessAuthCode { // ... normal session/JWT authentication checks ... // authOk = false if no valid session }

if !authOk { // Bypass: allow connection for auth page keepalive…