CVE-2025-66507

HIGH7.5

1Panel – CAPTCHA Bypass via Client-Controlled Flag

Published Dec 9, 2025

Modified 2 months ago

Details

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.

References

WEB

https://github.com/1Panel-dev/1Panel/commit/ac43f00273be745f8d04b90b6e2b9c1a40ef7bca

WEB

https://github.com/1Panel-dev/1Panel/releases/tag/v2.0.14

WEB

https://github.com/1Panel-dev/1Panel/security/advisories/GHSA-qmg5-v42x-qqhq

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2025-66507

CVSS Analysis

CVSS v3.1

7.5