CVE-2026-4399
7.5 · HIGHOverview
CVE-2026-4399 is a high-severity vulnerability affecting 1millionbot millie_chatbot. It was published on March 31, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
Prompt injection vulnerability in 1millionbot Millie chatbot that occurs when a user manages to evade chat restrictions using Boolean prompt injection techniques (formulating a question in such a way that, upon receiving an affirmative response ('true'), the model executes the injected instruction), causing it to return prohibited information and information outside its intended context. Successful exploitation of this vulnerability could allow a malicious remote attacker to abuse the service for purposes other than those originally intended, or even execute out-of-context tasks using 1millionbot's resources and/or OpenAI's API key. This allows the attacker to evade the containment mechanisms implemented during LLM model training and obtain responses or chat behaviors that were originally restricted.
Remediation
Check the references section for vendor advisories and patches from 1millionbot. Update millie_chatbot to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| 1millionbot | millie_chatbot | >= 0, < 3.6.0 | Affected |
Frequently Asked Questions
What is CVE-2026-4399?
CVE-2026-4399 is a high-severity vulnerability affecting 1millionbot millie_chatbot. It was published on March 31, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-4399?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-4399?
Check the references section for vendor advisories and patches from 1millionbot. Update millie_chatbot to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-4399?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-4399 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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