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CVE-2015-2309 affects the Symfony HttpFoundation Request class. When at least one trusted proxy is configured, unsafe request-handling methods can incorrectly trust client-supplied HTTP header values. As a result, header-derived properties exposed by methods such as getPort(), isSecure(), getHost(), and getClientIps() may be influenced by attacker-controlled input rather than only by values inserted by trusted infrastructure. The issue is specifically tied to proxy trust handling in deployments that rely on forwarded headers to reconstruct the original client request context.
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