CVE-2025-66508: 1Panel IP Access Control Bypass via Untrusted X-Forwarded-For Headers

December 8, 2025 (updated December 9, 2025)

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.

References

github.com/1Panel-dev/1Panel
github.com/1Panel-dev/1Panel/commit/94f7d78cc9768ee244da33e09408017d1f68b5ed
github.com/1Panel-dev/1Panel/security/advisories/GHSA-7cqv-qcq2-r765
github.com/advisories/GHSA-7cqv-qcq2-r765
nvd.nist.gov/vuln/detail/CVE-2025-66508

Code Behaviors & Features

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