Echo is a Go web framework. From 4.0.0 until 5.4.0, the Proxy middleware can preserve an attacker-supplied X-Real-IP header and forward it to an upstream service when Echo.IPExtractor is not configured. A remote client can therefore make upstream services receive a spoofed client address, undermining IP-based access controls, rate limiting, audit logging, or geographic restrictions that trust Echos forwarded identity. This issue is fixed in Echo 5.4.0.
Weakness
The product does not properly verify that the source of data or communication is valid.
Related Attack Patterns
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