CVE-2025-66507 HIGH

CVE-2025-66507: 1Panel – CAPTCHA Bypass via Client-Controlled Flag

Vendor 1Panel-Dev
Product 1Panel
Weakness CWE-602 · Client-side enforcement
Published December 9, 2025
Last update December 9, 2025
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

What the vulnerability does

01Description

1Panel is an open-source, web-based control panel for Linux server management. Versions 2.0.13 and below allow an unauthenticated attacker to disable CAPTCHA verification by abusing a client-controlled parameter. Because the server previously trusted this value without proper validation, CAPTCHA protections can be bypassed, enabling automated login attempts and significantly increasing the risk of account takeover (ATO). This issue is fixed in version 2.0.14.

Key dates

02Disclosure timeline

December 9, 2025 CVE published
December 9, 2025 Record updated