CVE-2025-66507CWE-290CWE-602CWE-807

CVE-2025-66507

High · published December 9, 2025

CVSS v3.1
7.5
EPSS
0%
Percentile
39.5
In the wild
Unconfirmed
What it is

⚡ An unauthenticated attacker can easily disable CAPTCHA verification in 1Panel versions 2.0.13 and below — it's like letting someone sneak into a party without checking their invite! 🎉 Think of CAPTCHA as a bouncer at a nightclub checking IDs. If the bouncer stops paying attention or trusts a fake ID handed to him, anyone can waltz in and cause chaos. In this case, the attacker tricks the server into thinking they're legit, bypassing the bouncer altogether. This vulnerability is a heart-stopper! An attacker able to bypass CAPTCHA can flood the login page with automated attempts, significantly increasing the likelihood of account takeover (ATO) for users. With just a few clicks, they could potentially gain unauthorized access to sensitive data and wreak havoc.

Put simply

Think of CAPTCHA as a bouncer at a nightclub checking IDs. If the bouncer stops paying attention or trusts a fake ID handed to him, anyone can waltz in and cause chaos. In this case, the attacker tricks the server into thinking they're legit, bypassing the bouncer altogether. This flaw exists because the server improperly trusts a client-controlled parameter, allowing an attacker to disable CAPTCHA protections without authentication. As a result, they can launch a barrage of automated login attempts without any barriers to entry.

What to do

This vulnerability is a heart-stopper! An attacker able to bypass CAPTCHA can flood the login page with automated attempts, significantly increasing the likelihood of account takeover (ATO) for users. With just a few clicks, they could potentially gain unauthorized access to sensitive data and wreak havoc. To secure your system, upgrade to version 2.0.14 immediately. Additionally, audit your parameters to ensure that no sensitive client-controlled values are trusted without proper validation. Regular security reviews can help catch these sneaky issues early! You've got this! By taking action now, you can ensure that your 1Panel installation is secure and protected. 🛡️

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00467 · 39.5th percentile
Weaknesses
CWE-290 · Authentication Bypass by Spoofing; CWE-602 · Client-Side Enforcement of Server-Side Security; CWE-807 · Reliance on Untrusted Inputs in a Security Decision
Published
2025-12-09T21:18Z
Affected products (1)
ProductVersionsFixed in
fit2cloud/1panel< 2.0.142.0.14
References (3)
EPSS history
Timeline
  • 09 DEC 01:25Z
    1Panel – CAPTCHA Bypass via Client-Controlled Flag
    cvelistv5