CVE-2025-66507

1Panel – CAPTCHA Bypass via Client-Controlled Flag

Published Dec 9, 2025 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-qmg5-v42x-qqhq 1Panel – CAPTCHA Bypass via Client-Controlled Flag
History
Type Values Removed Values Added
First Time appeared Fit2cloud
Fit2cloud 1panel
CPEs cpe:2.3:a:fit2cloud:1panel:*:*:*:*:*:*:*:*
Vendors & Products Fit2cloud
Fit2cloud 1panel
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared 1panel
1panel 1panel
Linux
Linux linux
Vendors & Products 1panel
1panel 1panel
Linux
Linux linux
Type Values Removed Values Added
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.
Title 1Panel – CAPTCHA Bypass via Client-Controlled Flag
Weaknesses CWE-290
CWE-602
CWE-807
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Dec 9, 2025, 4:03 PM
Reserved
Dec 3, 2025, 3:12 PM
Status
Analyzed
Published
Dec 9, 2025, 4:18 PM
Modified
Oct 14, 2026, 9:10 PM