1Panel IP Access Control Bypass via Untrusted X-Forwarded-For Headers

Exploitation

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

CVSS

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

EPSS

• CVE-2025-66508: 0.25% estimated exploitation activity in the next 30 days; percentile 16.89 (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 The server trusts all reverse-proxy headers by default, so any remote client can spoof X-Forwarded-For to bypass IP-based protections (AllowIPs, API IP whitelist, “localhost-only” checks). All IP-based access control becomes ineffective. Details - Gin is created with defaults (gin.Default()), which sets TrustedProxies = 0.0.0.0/0 and uses X-Forwarded-For/X-Real-IP to compute ClientIP(). - IP-based controls rely on ClientIP(): - AllowIPs / BindDomain (core/middleware/iplimit.go, core/utils/security/security.go). - API IP whitelist (core/middleware/apiauth.go). - "localhost-only" checks that depend on ClientIP(). - Because no trusted-proxy range is enforced, any client can send X-Forwarded-For: 127.0.0.1 (or a whitelisted IP) and be treated as coming from that address. Impact All IP-based access control is rendered ineffective: remote clients can masquerade as localhost or any whitelisted IP, defeating AllowIPs, API IP whitelists, and “localhost-only” protections.

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-7cqv-qcq2-r765

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# Patch Next advisory brief: CVE-2025-66508

Advisory: 1Panel IP Access Control Bypass via Untrusted X-Forwarded-For Headers
IDs: CVE-2025-66508, GHSA-7cqv-qcq2-r765
Record: https://patchnext.com/advisories/cve-2025-66508 (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: Medium (CVSS 6.5)
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 2.0.14; github.com/1Panel-dev/1Panel/agent 0.0.0-20251201063338-94f7d78cc976. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/1Panel-dev/1Panel: affected < 2.0.14; fixed in 2.0.14
- Go github.com/1Panel-dev/1Panel/agent: affected < 0.0.0-20251201063338-94f7d78cc976; fixed in 0.0.0-20251201063338-94f7d78cc976

## Suggested inspection (read-only)
- Go github.com/1Panel-dev/1Panel: check the installed version with your package manager.
- Go github.com/1Panel-dev/1Panel/agent: 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, github.com/1Panel-dev/1Panel/agent.
- 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-7cqv-qcq2-r765 (GitHub-reviewed advisory GHSA-7cqv-qcq2-r765 lists affected ranges: Go github.com/1Panel-dev/1Panel >=0 =0 <0.0.0-20251201063338-94f7d78cc976)

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