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CVE

CVE-2025-66481

DeepChat's Incomplete XSS Fix Allows RCE through Mermaid Content
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CVE

CVE-2025-66481

DeepChat's Incomplete XSS Fix Allows RCE through Mermaid Content

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.6
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66481.json, https://github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-h9f5-7hhf-fqm4, https://nvd.nist.gov/vuln/detail/CVE-2025-66481

Severity

9.6

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
9.6
EPSS Probability
0.00258%
EPSS Percentile
0.48838%
Introduced Version
0
Fix Available

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