CVE-2025-66222: critical vulnerability in ThinkInAIXYZ deepchat
DeepChat Cross-Site Scripting(XSS) escalate to Remote Code Execution(RCE)
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.7epss 0.7%
DeepChat is a smart assistant uses artificial intelligence. In 0.5.0 and earlier, there is a Stored Cross-Site Scripting (XSS) vulnerability in the Mermaid diagram renderer allows an attacker to execute arbitrary JavaScript within the application context. By leveraging the exposed Electron IPC bridge, this XSS can be escalated to Remote Code Execution (RCE) by registering and starting a malicious MCP (Model Context Protocol) server.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Affected products
ThinkInAIXYZ · deepchatRelated CVEs — ThinkInAIXYZ deepchat
In the same product, most dangerous first.
CVE-2025-55733CRITICALDeepChat One-click Remote Code Execution through Custom URL HandlingEPSS 0.7%CVE-2025-67744CRITICALMermaid XSS vulnerability leads to Remote Code ExecutionEPSS 0.6%CVE-2025-58768CRITICALDeepChat's Mermaid rendering has XSS leading to RCEEPSS 0.6%CVE-2025-66481CRITICALDeepChat's Incomplete XSS Fix Allows RCE through Mermaid ContentEPSS 0.6%CVE-2026-43899CRITICALDeepChat: Incomplete Fix for CVE-2025-55733 leads to Remote Code Execution via Markdown Links bypassing `isValidExternalUrl`EPSS 0.4%CVE-2026-43900CRITICALDeepChat: Persistent DOM XSS via HTML Entity Encoding in `<antArtifact>` SVG Rendering (Bypass of `svgSanitizer.ts`)EPSS 0.4%