CVE-2025-66481

critical · 9.6

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.

9.6

CVSS

0.6%

EPSS (exploit prob.)

46th

EPSS percentile

2025-12-09

Published

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

Weaknesses

CWE-79CWE-80CWE-94

Affected products

Vendor	Product	Affected versions
thinkinai	deepchat	<= 0.5.1

Check a specific version with /api/v1/cve/match.

References

https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-h9f5-7hhf-fqm4
https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-h9f5-7hhf-fqm4

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2025-66481