CVE-2026-4400CWE-639

Multiple vulnerabilities in 1millionbot Millie chatbot

High · published March 31, 2026

CVSS v4.0
7.0
EPSS
0%
Percentile
24.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.0 · HIGH
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
EPSS
0.00330 · 24.9th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-03-31T10:12Z
EPSS history
Timeline
  • 31 MAR 10:12Z
    Multiple vulnerabilities in 1millionbot Millie chatbot
    cvelistv5