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Q1What is this vulnerability? (Essence + Consequences)
π¨ **Essence**: DeepChat (v0.5.1 & older) has a critical flaw in **Mermaid content cleaning**.β¦
π‘οΈ **Root Cause**: **CWE-80** (Improper Neutralization of Input During Web Page Generation). <br>π **Flaw**: The system fails to properly sanitize **Mermaid** diagrams/code.β¦
π¦ **Affected**: **ThinkInAIXYZ**'s **DeepChat** product. <br>π **Versions**: **0.5.1 and earlier**. <br>π₯ **Users**: Anyone running these older versions of the open-source AI assistant is at risk.
Q4What can hackers do? (Privileges/Data)
π **Attacker Actions**: <br>1. **XSS**: Steal user cookies, session tokens, or redirect users. <br>2. **RCE**: Execute arbitrary commands on the server (if context allows).β¦
π **Public Exploit**: **No PoC provided** in the data. <br>π **Status**: Advisory published on GitHub (GHSA-h9f5-7hhf-fqm4). While no code is public, the flaw is well-understood.β¦
π **Self-Check**: <br>1. Check your DeepChat version (`< 0.5.2`). <br>2. Scan for **Mermaid** rendering components in your codebase. <br>3. Look for unsanitized input handling in markdown/diagram parsers. <br>4.β¦
π§ **Workaround (If no patch)**: <br>1. **Disable Mermaid**: Turn off diagram rendering if not essential. <br>2. **Input Sanitization**: Implement strict allow-lists for Mermaid syntax. <br>3.β¦
π₯ **Urgency**: **CRITICAL**. <br>π **Priority**: **P0**. <br>π **Reason**: CVSS Score is High (9.8 implied by H/H/H). RCE potential + XSS + Public Disclosure = Immediate patching required. Do not delay.