CVE-2025-40805CWE-639

Affected devices do not properly enforce user authentication on specific API endpoints

Critical · published January 13, 2026

CVSS v4.0
10.0
EPSS
1%
Percentile
50.6
In the wild
Unconfirmed
What it is

🚨 An unauthenticated remote attacker can impersonate legitimate users by exploiting API endpoint vulnerabilities. This flaw is like having a VIP pass that anyone can use without checking who they are! 🔥 Think of it like a restaurant where anyone can walk in, sit at a table reserved for a celebrity, and order anything off the menu just by claiming to be them. No one’s checking IDs, and chaos can ensue with personal information at stake! This vulnerability opens the door for attackers to act as a legitimate user, potentially accessing sensitive data or performing unauthorized actions. Imagine the nightmare if an attacker could change account settings or view private information without anyone noticing!

Put simply

Think of it like a restaurant where anyone can walk in, sit at a table reserved for a celebrity, and order anything off the menu just by claiming to be them. No one’s checking IDs, and chaos can ensue with personal information at stake! The vulnerability arises from improper enforcement of user authentication on specific API endpoints, allowing attackers to bypass authentication mechanisms provided they know a legitimate user's identity.

What to do

This vulnerability opens the door for attackers to act as a legitimate user, potentially accessing sensitive data or performing unauthorized actions. Imagine the nightmare if an attacker could change account settings or view private information without anyone noticing! To mitigate this risk, immediately patch the affected devices to the latest firmware version that addresses CVE-2025-40805. Additionally, ensure strong user authentication checks are in place for all API endpoints, regardless of user identity confirmation. Regularly audit permissions and access controls to prevent any unauthorized changes. You've got this! Follow these steps to secure your system and keep those impersonators out! 🛡️

The record
Technical detail
CVSS v4.0
10.0 · CRITICAL
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
EPSS
0.00653 · 50.6th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-01-13T09:44Z
EPSS history
Timeline
  • 13 JAN 09:44Z
    Affected devices do not properly enforce user authentication on specific API endpoints
    cvelistv5