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Vulnerability record · CVE-2025-66507 · published 9 December 2025

CVE-2025-66507: Fit2cloud 1panel authentication bypass by spoofing vulnerability

Fit2cloud · 1panel

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.

7.5 CVSS 3.1 High EPSS 0.47% · top 62.1% CWE-290 · Authentication bypass by spoofingCWE-602 · CWE-602
7.5CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/1Panel-dev/1Panel/commit/ac43f00273be745f8d04b90b6e2b9c1a40ef7bca Patch
https://github.com/1Panel-dev/1Panel/releases/tag/v2.0.14 Release Notes
https://github.com/1Panel-dev/1Panel/security/advisories/GHSA-qmg5-v42x-qqhq Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-66507), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.