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CVE-2026-54734

Prebid Server Java: Vulnerability to request forgery allows for possible host environment data extraction

CVSS 3.1 10.0 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-54734

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-54734

Published

prebid-server-java

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "prebid",
                    "product": "prebid-server-java",
                    "versions": [
                        {
                            "version": "< 3.43.0",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON