1Panel – CAPTCHA Bypass via Client-Controlled Flag

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2025-66507: 0.46% estimated exploitation activity in the next 30 days; percentile 40.19 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary A CAPTCHA bypass vulnerability in the 1Panel authentication API allows 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 could be bypassed, enabling automated login attempts and significantly increasing the risk of account takeover (ATO). Details The /api/login endpoint accepts a boolean field named ignoreCaptcha directly from the client request body: "ignoreCaptcha": true The backend implementation uses this value to determine whether CAPTCHA validation should be performed: Because req.IgnoreCaptcha is taken directly from user input—with no server-side validation, no session binding, and no privilege checks—any unauthenticated attacker can force CAPTCHA validation to be skipped. There are no additional conditions, such as: no requirement for MFA no trusted device no IP reputation checks no prior valid session no rate limiting…

Published by the source

8 Dec 2025, 17:56 UTC

Last modified by the source

9 Dec 2025, 19:19 UTC

Source last checked

26 Oct 2026, 15:13 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-qmg5-v42x-qqhq

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# Patch Next advisory brief: CVE-2025-66507

Advisory: 1Panel – CAPTCHA Bypass via Client-Controlled Flag
IDs: CVE-2025-66507, GHSA-qmg5-v42x-qqhq
Record: https://patchnext.com/advisories/cve-2025-66507 (revision 1, source checked 26 Oct 2026, 15:13 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/1Panel-dev/1Panel/core 0.0.0-20251128030527-ac43f00273be; github.com/1Panel-dev/1Panel 2.0.14. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/1Panel-dev/1Panel/core: affected < 0.0.0-20251128030527-ac43f00273be; fixed in 0.0.0-20251128030527-ac43f00273be
- Go github.com/1Panel-dev/1Panel: affected < 2.0.14; fixed in 2.0.14

## Suggested inspection (read-only)
- Go github.com/1Panel-dev/1Panel/core: check the installed version with your package manager.
- Go github.com/1Panel-dev/1Panel: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/1Panel-dev/1Panel/core, github.com/1Panel-dev/1Panel.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-qmg5-v42x-qqhq (GitHub-reviewed advisory GHSA-qmg5-v42x-qqhq lists affected ranges: Go github.com/1Panel-dev/1Panel >=0 =0 <0.0.0-20251128030527-ac43f00273be)

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