Cloudanix VulnDB

GHSA-xp2m-98x8-rpj6

Medium · 4.3

SiYuan Vulnerable to Cross-Origin WebSocket Hijacking via Authentication Bypass — Unauthenticated Information Disclosure

CVSS

4.3

EPSS

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Published

Mar 16, 2026

CISA due date

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The record

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 packages

Ecosystem Package Introduced Fixed

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