What happened
Spring Cloud Gateway Server forwards the X-Forwarded-For and Forwarded headers from untrusted proxies in certain configuration scenarios. This affects both the WebMVC and WebFlux Gateway Servers. Affected versions: Spring Cloud Gateway 3.1.x (fix 3.1.13). Spring Cloud Gateway 4.1.x (fix 4.1.13). Spring Cloud Gateway 4.2.x (fix 4.2.9). Spring Cloud Gateway 4.3.x (fix 4.3.5). Spring Cloud Gateway 5.0.x (fix 5.0.2).
Affected versions
Spring Cloud Gateway: 3.1.0 through before 3.1.13 (custom); 4.1.0 through before 4.1.13 (custom); 4.2.0 through before 4.2.9 (custom); 4.3.0 through before 4.3.4.1 (custom); 5.0.0 through before 5.0.1.1 (custom) Fixed: See vendor advisory.
Why it matters
Review the vendor advisory and exposure of the affected product to determine operational impact.
Detection & mitigation
- Apply vendor-provided updates or mitigations.
- Review affected product exposure and access logs.
Public PoC references
No public PoC reference has passed the current publication threshold.