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EUVD-2026-262942

fkie_cve-2025-66508

1Panel is an open-source, web-based control panel for Linux server management. Versions 2.0.14 and below use Gin's default configuration which trusts all IP addresses as proxies (TrustedProxies = 0.0.0.0/0), allowing any client to spoof the X-Forwarded-For header. Since all IP-based access controls (AllowIPs, API whitelists, localhost-only checks) rely on ClientIP(), attackers can bypass these protections by simply sending X-Forwarded-For: 127.0.0.1 or any whitelisted IP. This renders all IP-based security controls ineffective. This issue is fixed in version 2.0.14.

GHSA-7cqv-qcq2-r765 — 1Panel IP Access Control Bypass via Untrusted X-Forwarded-For Headers

Affected: Go: github.com/1Panel-dev/1Panel, Go: github.com/1Panel-dev/1Panel/agent

### 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/ip_limit.go, core/utils/security/security.go). - API IP whitelist (core/middleware/api_auth.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.