CVE-2026-4400 Multiple vulnerabilities in 1millionbot Millie chatbot
Remote attackers can view other users' private chatbot conversations by manipulating conversation IDs, exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4400?
CVE-2026-4400 is a high-severity missing authorization vulnerability in 1millionbot Millie chat, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-639
Which versions are affected by CVE-2026-4400?
It affects 1 product.
Products include 1millionbot Millie Chatbot.
How do I fix CVE-2026-4400?
No fix has been published for CVE-2026-4400 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-4400 being exploited?
There is no known exploitation of CVE-2026-4400 in the wild and no public exploit code.
Other vulnerabilities in 1millionbot Millie chat
Sources
Also known as GHSA-7h53-73g8-fjvr.