CVE-2025-66222: DeepChat is a smart assistant uses artificial intelligence

Q: How do I fix CVE-2025-66222?

deepchat: upgrade to newer than 0.5.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-66222 being exploited?

CVE-2025-66222 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-66222 affect?

CVE-2025-66222 affects deepchat. Severity is critical (CVSS 9.6). DeepChat is a smart assistant uses artificial intelligence. In 0.5.0 and earlier, there is a Stored Cross-Site Scripting (XSS) vulnerability in the Mermaid diagram renderer allows an attacker to execute arbitrary JavaScript within the appli

Q: How urgent is CVE-2025-66222?

Priority 51/100. Critical severity; Public exploit reference

This month

CRITICAL 9.6UPGRADE

CVE-2025-66222 is a critical-severity flaw (CVSS 9.6) affecting deepchat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

DeepChat is a smart assistant uses artificial intelligence. In 0.5.0 and earlier, there is a Stored Cross-Site Scripting (XSS) vulnerability in the Mermaid diagram renderer allows an attacker to execute arbitrary JavaScript within the application context. By leveraging the exposed Electron IPC bridge, this XSS can be escalated to Remote Code Execution (RCE) by registering and starting a malicious MCP (Model Context Protocol) server.

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-94, CWE-79
Published	2025-12-03
Last modified	2026-10-18

Publisher (CNA): GitHub, Inc. · Vendor: thinkinai

Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-03 19:15 UTCPublished CVE record published
2026-10-18 17:10 UTCUpdated Record last modified

thinkinai deepchat UPGRADE

Affected: <= 0.5.0

Fixed in: newer than 0.5.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy deepchat || rpm -q deepchat || deepchat --version

2. UPGRADE to newer than 0.5.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade deepchat

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade deepchat

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-66222?

deepchat: upgrade to newer than 0.5.0. Exact commands for each OS are on this page.

Is CVE-2025-66222 being exploited?

CVE-2025-66222 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-66222 affect?

CVE-2025-66222 affects deepchat. Severity is critical (CVSS 9.6). DeepChat is a smart assistant uses artificial intelligence. In 0.5.0 and earlier, there is a Stored Cross-Site Scripting (XSS) vulnerability in the Mermaid diagram renderer allows an attacker to execute arbitrary JavaScript within the appli

How urgent is CVE-2025-66222?

Priority 51/100. Critical severity; Public exploit reference

Software pages

Electron vulnerabilities

Related CVEs

CVE-2025-66481 CRITICAL 9.6 UPGRADE DeepChat is an open-source AI chat platform that supports cloud models and LLMs
CVE-2025-67744 CRITICAL 9.6 UPGRADE DeepChat is an open-source artificial intelligence agent platform that unifies models, tools, and agents
CVE-2025-58768 CRITICAL 9.6 UPGRADE DeepChat is a smart assistant uses artificial intelligence
CVE-2025-55733 CRITICAL 9.6 DOWNGRADE DeepChat is a smart assistant that connects powerful AI to your personal world

References

← Back to latest CVEs