CVE•Published 2025-12-09•Modified 2026-10-07•1 article on news•5 live references•NVD data

CVE-2025-66481Thinkinai · Deepchat

Vulnerability data via NVD (ingested)

CVSS v3.1

9.6

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS percentile

Exploit Prediction Scoring System · top 54% of all CVEs

Weaknesses (CWE)

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)CWE-94Improper Control of Generation of Code ('Code Injection')

Description

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.

Timeline

Published 2025-12-09

Modified 2026-10-07

External references

NVD MITRE Exploit-DB trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2025-66481

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Thinkinai Deepchat"

All exposed Thinkinai Deepchat instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Deepchat"

HTTP body or banner mentions "Deepchat" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2025-66481