CVE-2025-66481: DeepChat is an open-source AI chat platform that supports cloud models and LLMs

Q: How do I fix CVE-2025-66481?

deepchat: upgrade to newer than 0.5.1. Exact commands for each OS are on this page.

Q: Is CVE-2025-66481 being exploited?

CVE-2025-66481 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-2025-66481 affect?

CVE-2025-66481 affects deepchat. Severity is critical (CVSS 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 insuf

Q: How urgent is CVE-2025-66481?

Priority 50/100. Critical severity; Public exploit reference

This month

CRITICAL 9.6UPGRADE

CVE-2025-66481 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 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 reg

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 52%)
CISA exploited list	No
Weakness	CWE-79, CWE-80, CWE-94
Published	2025-12-09
Last modified	2026-10-07

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

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-09 01:16 UTCPublished CVE record published
2026-10-07 20:10 UTCUpdated Record last modified

thinkinai deepchat UPGRADE

Affected: <= 0.5.1

Fixed in: newer than 0.5.1

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 0.5.1 (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-2025-66481?

deepchat: upgrade to newer than 0.5.1. Exact commands for each OS are on this page.

Is CVE-2025-66481 being exploited?

CVE-2025-66481 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-2025-66481 affect?

CVE-2025-66481 affects deepchat. Severity is critical (CVSS 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 insuf

How urgent is CVE-2025-66481?

Priority 50/100. Critical severity; Public exploit reference

Software pages

Electron vulnerabilities

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References

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