CVE-2025-56221

A lack of rate limiting in the login mechanism of SigningHub v8.6.8 allows attackers to bypass authentication via a brute force attack

Critical · published October 17, 2025

CVSS v3.1
9.8
EPSS
1%
Percentile
47.8
In the wild
Unconfirmed
What it is

🚨 No rate limiting in SigningHub v8.6.8 makes it alarmingly easy for attackers to blitz through logins like kids on a sugar rush! 🔥 Think of it like a front desk at a busy hotel where guests can try any room key without a limit—eventually, someone will get into a room that isn't theirs. This lapse in security opens the door for attackers to crank up their attempts until they find the right combination to gain unauthorized access. An attacker could relentlessly hammer away at the login page, bypassing authentication entirely and potentially gaining access to sensitive information or systems. This is absolutely devastating because, once inside, they could wreak havoc, steal data, or manipulate settings at will!

Put simply

Think of it like a front desk at a busy hotel where guests can try any room key without a limit—eventually, someone will get into a room that isn't theirs. This lapse in security opens the door for attackers to crank up their attempts until they find the right combination to gain unauthorized access. The vulnerability stems from a missing rate limiting control in the login mechanism, allowing brute force attacks to succeed without any restrictions on the number of attempts.

What to do

An attacker could relentlessly hammer away at the login page, bypassing authentication entirely and potentially gaining access to sensitive information or systems. This is absolutely devastating because, once inside, they could wreak havoc, steal data, or manipulate settings at will! To protect your systems, patch SigningHub to version 8.6.9 or later immediately, and implement robust rate limiting to thwart any potential brute force attacks. Additionally, consider enhancing your login security with two-factor authentication for added protection. You’ve got this! With these steps, you’ll be closing the door on attackers in no time! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00597 · 47.8th percentile
Published
2025-10-17T00:00Z
EPSS history
Timeline
  • 17 OCT 00:00Z
    A lack of rate limiting in the login mechanism of SigningHub v8.6.8 allows attackers to bypass authentication via a brute force attack
    cvelistv5