Vulnerability Details CVE-2026-4400
Insecure Direct Object Reference (IDOR) vulnerability in 1millionbot Millie chat that allows private conversations of other users being viewed by simply changing the conversation ID. The vulnerability is present in the endpoint 'api.1millionbot.com/api/public/conversations/' and, if exploited, could allow a remote attacker to access other users private chatbot conversations, revealing sensitive or confidential data without requiring credentials or impersonating users. In order for the vulnerability to be exploited, the attacker must have the user's conversation ID.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 49.0%
CVSS Severity
CVSS v3 Score 6.5
Products affected by CVE-2026-4400
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cpe:2.3:a:1millionbot:millie_chat_bot:*