Vulnerability details

CVE-2026-4399

1millionbot Millie chat

Multiple vulnerabilities in 1millionbot Millie chatbot

CVSS 4.0
8.7High

Official 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.

CVSS scores

ScoreVersionSourceVector
8.7High 4.0 CVEProject cvelistV5 (CNA) (INCIBE) CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Affected products

VendorProductVersionsSource
1millionbot Millie chat 3.6.0 CVEProject cvelistV5 (CNA)

References and advisories

1
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Details

Published
2026-03-31
Last updated
2026-03-31
State
Published
Assigner (CNA)
INCIBE

Exploit prediction (EPSS)

0.26%
Probability of exploitation in 30 days
19.1%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
Yes
Exploitation
None
Technical impact
Partial

Weaknesses (CWE)

  • CWE-1427
    Improper neutralization of input used for LLM prompting