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TI-2025-41440 Aliases CVE-2025-67744

Mermaid XSS vulnerability leads to Remote Code Execution

Priority HIGH 76CWE-94Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

DeepChat is an open-source artificial intelligence agent platform that unifies models, tools, and agents. Prior to version 0.5.3, a security vulnerability exists in the Mermaid diagram rendering component that allows arbitrary JavaScript execution. Due to the exposure of the Electron IPC renderer to the DOM, this Cross-Site Scripting (XSS) flaw escalates to full Remote Code Execution (RCE), allowing an attacker to execute arbitrary system commands. Two concurrent issues, unsafe Mermaid configuration and an exposed IPC interface, cause this issue. Version 0.5.3 contains a patch.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00629 50th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed deepchat (ThinkInAIXYZ): 0.5.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ThinkInAIXYZdeepchatbefore 0.5.30.5.3Patch availableCNA
  • deepchat VendorThinkInAIXYZ Affected before 0.5.3 Fixed in 0.5.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:thinkinai:deepchat:*:*:*:*:*:*:*:*before 0.5.3VulnerableThinkInAIXYZ
  • cpe:2.3:a:thinkinai:deepchat:*:*:*:*:*:*:*:* Versions before 0.5.3 Vulnerable ·ThinkInAIXYZ

Remediation

  • Fix · CNA deepchat (ThinkInAIXYZ) Fixed in 0.5.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-67744
  2. 2026-10-29 EPSS moved to the 50th–90th percentile

References

Exploit 1

Patch 1

  • TI-2025-40905 DeepChat's Incomplete XSS Fix Allows RCE through Mermaid Content CVSS 3.1CRITICAL 9.7
  • TI-2025-40724 DeepChat Cross-Site Scripting(XSS) escalate to Remote Code Execution(RCE) CVSS 3.1CRITICAL 9.7
  • TI-2025-35154 DeepChat One-click Remote Code Execution through Custom URL Handling CVSS 3.1CRITICAL 9.7
  • TI-2025-36426 DeepChat's Mermaid rendering has XSS leading to RCE CVSS 3.1CRITICAL 9.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences