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TI-2026-31963 Aliases CVE-2026-43899

Improper input validation in ThinkInAIXYZ deepchat

Priority HIGH 76CWE-20Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

DeepChat is an open-source artificial intelligence agent platform that unifies models, tools, and agents. Prior to v1.0.4-beta.1, An incomplete mitigation for CVE-2025-55733 leaves DeepChat vulnerable to an arbitrary protocol execution bypass (RCE). While the patch correctly restricted api.openExternal() inside the renderer's preload/index.ts script, it structurally neglected to sanitize native Electron pop-up window handlers. An attacker or a compromised AI endpoint returning a Markdown link can trigger a target="_blank" native window interception in tabPresenter.ts, which forwards the malicious URL directly to shell.openExternal(url) and completely bypasses the isValidExternalUrl security boundary. This vulnerability is fixed in v1.0.4-beta.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00401 34th percentileScored 2026-11-07
Fix Fixed deepchat (ThinkInAIXYZ): 1.0.4-beta.1

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 1.0.4-beta.11.0.4-beta.1Patch availableCNA
  • deepchat VendorThinkInAIXYZ Affected before 1.0.4-beta.1 Fixed in 1.0.4-beta.1 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:thinkinai:deepchat:*:*:*:*:*:*:*:*——ThinkInAIXYZ
  • cpe:2.3:a:thinkinai:deepchat:*:*:*:*:*:*:*:* Versions — — ·ThinkInAIXYZ

Remediation

  • Fix · CNA deepchat (ThinkInAIXYZ) Fixed in 1.0.4-beta.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-43899

References

Other 1

  • TI-2025-41440 Mermaid XSS vulnerability leads to Remote Code Execution CVSS 3.1CRITICAL 9.7
  • 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-2026-31964 DeepChat: Persistent DOM XSS via HTML Entity Encoding in `<antArtifact>` SVG Rendering (Bypass of `svgSanitizer.ts`) CVSS 3.1CRITICAL 9.3
  • 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