CVE-2026-54734
CriticalCVSS 10.0Summary
In Prebid Server Java prior to 3.43.0, certain bidder adapters interpolate user-supplied parameters into outbound request URLs without using HttpUtil to validate the resulting domain or path segment. A malicious actor who can supply bid-request parameters can cause the server to send HTTP requests to unintended destinations, including internal services or metadata endpoints.
Risk Assessment
An attacker can use the server to scan and reach internal network services or metadata endpoints, potentially leading to credential leakage.
Recommendation
Update Prebid Server Java to version 3.43.0 or later and consider restricting outbound network traffic from the server.
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Original NVD description (English source)
Prebid Server Java is the Java version of Prebid Server. Prior to 3.43.0, certain bidder adapters interpolate user-supplied parameters into outbound request URLs without using HttpUtil to validate the resulting domain or path segment. A malicious actor who can supply bid-request parameters can cause the server to send HTTP requests to unintended destinations, potentially reaching internal network services, metadata endpoints, or other sensitive server endpoints with the server's network access. This issue is fixed in version 3.43.0.