CVE-2025-66507

1Panel – CAPTCHA Bypass via Client-Controlled Flag

State: Published
Severity: 7.5 High
Published: Dec 9, 2025
Updated: Dec 9, 2025
Reserved: Dec 3, 2025

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	GitHub_M

Weaknesses

CWE-602 Client-Side Enforcement of Server-Side Security
CWE-807 Reliance on Untrusted Inputs in a Security Decision
CWE-290 Authentication Bypass by Spoofing

Affected Products

Product	Versions
1Panel1Panel-dev	< 2.0.14Affected

References

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