CVE-2026-54734 — Prebid Server Java: Vulnerability to request forgery allows for possible host environment data extraction
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 H…
Published: 2026-09-17 · CVSS: 10.0 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7