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Q1What is this vulnerability? (Essence + Consequences)
🚨 **Essence**: Stored XSS via unsanitized table titles in SiYuan. 💥 **Consequences**: Leads to Remote Code Execution (RCE). Critical risk to data integrity and system control.
Q2Root Cause? (CWE/Flaw)
🛡️ **Root Cause**: CWE-79 (Stored XSS). The flaw lies in **unsafe escaping** of table title content during storage. Malicious scripts persist in the database.
Q3Who is affected? (Versions/Components)
📦 **Affected**: **SiYuan Note** (Privacy-first PKM). Specifically versions **prior to 3.6.4**. All users on older builds are at risk.
Q4What can hackers do? (Privileges/Data)
💀 **Attacker Capabilities**: Can execute arbitrary code remotely. Full access to **Confidentiality, Integrity, and Availability** (CVSS H/H/H). Can hijack user sessions.
Q5Is exploitation threshold high? (Auth/Config)
⚠️ **Exploitation**: **Low Threshold**. Requires **Low Complexity** and **User Interaction** (UI:R). Needs **Low Privileges** (PR:L) to inject, but impact is High (S:C).
Q6Is there a public Exp? (PoC/Wild Exploitation)
🔍 **Public Exploit**: **None listed** in current data (POCs: []). However, the severity suggests high potential for future wild exploitation. Stay vigilant.
Q7How to self-check? (Features/Scanning)
🔎 **Self-Check**: Scan for **Table Titles** containing script tags or HTML entities. Check if your SiYuan version is **< 3.6.4**. Look for unexpected JS execution in notes.
Q8Is it fixed officially? (Patch/Mitigation)
✅ **Fix Status**: **Yes**. Official advisory available on GitHub (GHSA-phhp-9rm9-6gr2). Upgrade to **SiYuan 3.6.4 or later** immediately.
Q9What if no patch? (Workaround)
🚧 **No Patch Workaround**: If stuck, **disable table editing** or strictly sanitize input. Avoid clicking untrusted notes. Isolate the instance from the network.
Q10Is it urgent? (Priority Suggestion)
🔥 **Urgency**: **CRITICAL**. CVSS is High. RCE via Stored XSS is a top-tier threat. **Patch immediately** to prevent potential compromise.