CRITICAL 10.0 NVD
CVE-2026-54734
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 URL
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.
References
- https://github.com/prebid/prebid-server-java/commit/a129a685b6fc54441c1a779ce29ea4ec20c2e0
- https://github.com/prebid/prebid-server-java/commit/d0c723ce36aa09712c825ea9625d978f45d29a
- https://github.com/prebid/prebid-server-java/pull/4522
- https://github.com/prebid/prebid-server-java/releases/tag/3.43.0
- https://github.com/prebid/prebid-server-java/security/advisories/GHSA-fr2c-g2f8-qchg
This critical severity vulnerability with a CVSS score of 10.0 was published on 2026-09-17 via NVD.
Risk Timeline
CVE Disclosed2026-09-17 · -1 days ago
Remediation Resources
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