CVE-2025-66222Public exploitNetwork attack vector

Remote code execution via unsanitized Mermaid HTML

Published Dec 3, 2025 · Updated Dec 3, 2025

Stored XSS in ThinkInAIXYZ DeepChat 0.5.0 and earlier allows remote attackers to execute commands through rendered Mermaid content. MermaidArtifact.vue assigns untrusted diagram content to innerHTML before sanitization, exposing ipcRenderer calls that register and start an unchecked MCP command. Exploitation requires the application to render attacker-controlled content, but default settings suffice and commands run with the victim's account privileges.

CVSS severity9.6
Critical
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in ThinkInAIXYZ DeepChat 0.5.0 and earlier allows remote attackers to execute commands through rendered Mermaid content. MermaidArtifact.vue assigns untrusted diagram content to innerHTML before sanitization, exposing ipcRenderer calls that register and start an unchecked MCP command. Exploitation requires the application to render attacker-controlled content, but default settings suffice and commands run with the victim's account privileges.

The record

CVE
CVE-2025-66222
Published
Dec 3, 2025
Updated
Dec 3, 2025
Vendor
ThinkInAIXYZ
Product
DeepChat
Classifications
CWE-94, T1204
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ThinkInAIXYZ · DeepChatversion=< 0.5.0

Published CVSS scores

9.6GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1204User Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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