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Q1What is this vulnerability? (Essence + Consequences)
🚨 **Root Cause**: The SiYuan Note core HTTP server **unconditionally trusts** requests from the `chrome-extension://` origin, leading to **unauthorized access**.<br>🔥 **Impact**: Attackers can obtain **administrator priv…
🛡️ **CWE**: Authentication Bypass.<br>🔍 **Flaw Point**: The `CheckAuth` middleware has a logic flaw; it only checks if the Origin header is `chrome-extension://`, but **fails to verify** the actual Access Token (AccessAu…
👑 **Privileges**: Directly obtains the **RoleAdministrator** (Administrator role).<br>💾 **Data**: Can read all personal knowledge base data.<br>💉 **Attack**: Inject stored XSS, tamper with application configuration, or e…
📉 **Extremely low barrier to entry**.<br>🔑 **Authentication**: **No authentication required**.<br>⚙️ **Configuration**: Exploits the default **empty AccessAuthCode** of the desktop version; simply combine this with a for…
📜 **Ready-to-use Exploits Available**.<br>🔗 **PoC**: ProjectDiscovery Nuclei template has been released (`CVE-2026-54069.yaml`).<br>🌍 **In the Wild**: Although large-scale exploitation in the wild has not been explicitly…
🔍 **Self-Check Characteristics**:<br>1. Check if the SiYuan Note version is < 3.7.0.<br>2. Check if the local service `127.0.0.1:6806` is running.<br>3.…
✅ **Fixed**.<br>🛠️ **Patch**: The official fix was included in **version 3.7.0**, which adds strict authentication mechanisms. Upgrading immediately is recommended.
Q9What if no patch? (Workaround)
🚧 **Temporary Mitigation**:<br>1. **Upgrade** to version 3.7.0 or later (preferred).<br>2. If upgrading is not possible, set a strong password for the **AccessAuthCode**.<br>3.…
🔴 **Priority: High**.<br>⚠️ **Reason**: It affects core privileges, is extremely easy to exploit (no authentication required), and involves local data security and XSS risks.…