What is CVE-2025-66481?

CVE-2025-66481 is a critical-severity vulnerability in Thinkinai Deepchat, classified under Cross-site Scripting. CVSS score: 9.6/10. Published 2025-12-09.

How severe is CVE-2025-66481?

Critical severity. CVSS v3 base score is 9.6 out of 10.

RCE in Thinkinai Deepchat

CVE-2025-66481

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 insu…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.005 (39.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Thinkinai Deepchat
Thinkinaixyz Deepchat — versions <= 0.5.1

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2025-66481?: CVE-2025-66481 is a critical-severity vulnerability in Thinkinai Deepchat, classified under Cross-site Scripting. CVSS score: 9.6/10. Published 2025-12-09.
How severe is CVE-2025-66481?: Critical severity. CVSS v3 base score is 9.6 out of 10.