CVE-2025-66698

An issue in Semantic machines v5.4.8 allows attackers to bypass authentication via sending a crafted HTTP request to various API endpoints

High · published January 13, 2026

CVSS v3.1
8.6
EPSS
0%
Percentile
41.3
In the wild
Unconfirmed
What it is

⚡ An attacker can bypass authentication just by sending a crafted HTTP request — it's like sneaking in through a side door that was never locked! 🔓 Picture a restaurant where diners can just waltz into the kitchen because the back door was left ajar. That's how this vulnerability allows unauthorized access to sensitive API endpoints without breaking a sweat! If exploited, this could allow malicious actors to access restricted data, manipulate resources, or wreak havoc on your system — all without needing a password! This could lead to serious consequences, including data breaches and loss of user trust.

Put simply

Picture a restaurant where diners can just waltz into the kitchen because the back door was left ajar. That's how this vulnerability allows unauthorized access to sensitive API endpoints without breaking a sweat! This vulnerability in Semantic Machines v5.4.8 allows attackers to send specially crafted HTTP requests to API endpoints, effectively bypassing the authentication checks that should be in place.

What to do

If exploited, this could allow malicious actors to access restricted data, manipulate resources, or wreak havoc on your system — all without needing a password! This could lead to serious consequences, including data breaches and loss of user trust. Immediate action is crucial! Upgrade to Semantic Machines version 5.4.9 or later to patch this vulnerability. Additionally, review your API security configurations to ensure all endpoints are properly protected. You've got this! With these actions, you'll reinforce your defenses and keep your system secure. 🛡️

The record
Technical detail
CVSS v3.1
8.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00491 · 41.3th percentile
Published
2026-01-13T00:00Z
EPSS history
Timeline
  • 13 JAN 00:00Z
    An issue in Semantic machines v5.4.8 allows attackers to bypass authentication via sending a crafted HTTP request to various API endpoints
    cvelistv5