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TI-2026-31964 Aliases CVE-2026-43900

DeepChat: Persistent DOM XSS via HTML Entity Encoding in `<antArtifact>` SVG Rendering (Bypass of `svgSanitizer.ts`)

Priority HIGH 75CWE-79Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

DeepChat is an open-source artificial intelligence agent platform that unifies models, tools, and agents. Prior to v1.0.4-beta.1, a Cross-Site Scripting (XSS) vulnerability exists due to a discrepancy between the backend validation layer and the frontend browser rendering engine. The SVGSanitizer (src/main/lib/svgSanitizer.ts) restricts script execution by scrubbing javascript: protocols using plain-text regular expressions. However, it fails to account for HTML entity decoding prior to Vue's v-html DOM insertion inside the SvgArtifact.vue component. By feeding an SVG artifact with obfuscated entities (e.g., j&#x61;vascript:alert(1)), an attacker can completely bypass the sanitizer, culminating in arbitrary JavaScript execution when a victim interacts with the rendered SVG Element. 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 0.00373 31st 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-2026-43900

References

Other 1

  • TI-2026-31963 Improper input validation in ThinkInAIXYZ deepchat CVSS 3.1CRITICAL 9.6
  • 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-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