CVE-2025-66481: critical vulnerability in ThinkInAIXYZ deepchat
DeepChat's Incomplete XSS Fix Allows RCE through Mermaid Content
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 0.6%
DeepChat is an open-source AI chat platform that supports cloud models and LLMs. Versions 0.5.1 and below are vulnerable to XSS attacks through improperly sanitized Mermaid content. The recent security patch for MermaidArtifact.vue is insufficient and can be bypassed using unquoted HTML attributes combined with HTML entity encoding. Remote Code Execution is possible on the victim's machine via the electron.ipcRenderer interface, bypassing the regex filter intended to strip dangerous attributes. There is no fix at time of publication.
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-2025-66222CRITICALDeepChat Cross-Site Scripting(XSS) escalate to Remote Code Execution(RCE)EPSS 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-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%