Vulnerability · Published Mar 31, 2026 · Assigned by INCIBE
CVE-2026-4400Multiple vulnerabilities in 1millionbot Millie chatbot
High 7.0
In plain English
A high-severity authorization bypass via user-controlled key in Millie chat from 1millionbot. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| 1millionbot | Millie chat | 3.6.0 |
Weakness: CWE-639 · Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N