How severe is CVE-2025-66222?

CVE-2025-66222 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-66222 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66222?

CVE-2025-66222 affects Thinkinai Deepchat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66222?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-66222 have an EU (EUVD) identifier?

Yes. CVE-2025-66222 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201091.

When was CVE-2025-66222 published?

CVE-2025-66222 was published on 2025-12-03 and last updated on 2026-06-17.

CVE-2025-66222

CVE-2025-66222 is a critical-severity vulnerability in Thinkinai Deepchat with a CVSS 3.x base score of 9.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201091
Weakness: CWE-79
Affected product: Thinkinai Deepchat
Published: 2025-12-03
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2025-66222?: 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.
How severe is CVE-2025-66222?: CVE-2025-66222 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-66222 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66222?: CVE-2025-66222 affects Thinkinai Deepchat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66222?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-66222 have an EU (EUVD) identifier?: Yes. CVE-2025-66222 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201091.
When was CVE-2025-66222 published?: CVE-2025-66222 was published on 2025-12-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:thinkinai:deepchat:*:*:*:*:*:*:*:*

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