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CVE-2026-54734

10.0 · CRITICAL

Prebid Server Java is the Java version of Prebid Server.

Published Sep 17, 2026CWE-918EPSS 0.62%

Overview

CVE-2026-54734 is a critical-severity vulnerability. It was published on September 17, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/prebid/prebid-server-java/commit/a129a685b6fc54441c1a779ce29ea4ec20c2e09fGitHubgithub.com/prebid/prebid-server-java/commit/d0c723ce36aa09712c825ea9625d978f45d29a1cGitHubgithub.com/prebid/prebid-server-java/pull/4522GitHubgithub.com/prebid/prebid-server-java/releases/tag/3.43.0GitHubgithub.com/prebid/prebid-server-java/security/advisories/GHSA-fr2c-g2f8-qchg

How CyberStrike helps

Frequently asked questions

What is CVE-2026-54734?

CVE-2026-54734 is a critical-severity vulnerability. It was published on September 17, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2026-54734?

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-54734?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-54734?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-54734 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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