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CVE-2026-54735

10.0 · CRITICAL

Prebid Server is an open-source solution for running real-time advertising auctions in the cloud.

Published Jul 29, 2026CWE-918EPSS 0.61%

Overview

CVE-2026-54735 is a critical-severity vulnerability. It was published on July 29, 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 is an open-source solution for running real-time advertising auctions in the cloud. Prior to version 4.4.0, certain bidder adapters in Prebid Server interpolate user-supplied parameters into outbound request URLs without properly validating host and subdomain values, allowing crafted bid request parameters to cause server-side requests to unintended destinations and potentially expose internal network services or sensitive server endpoints. This issue is fixed in version 4.4.0.

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/commit/494ac271cd4b5024df9123ef25ca3cff96390be3GitHubgithub.com/prebid/prebid-server/pull/4802GitHubgithub.com/prebid/prebid-server/releases/tag/v4.4.0GitHubgithub.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx

How CyberStrike helps

Frequently asked questions

What is CVE-2026-54735?

CVE-2026-54735 is a critical-severity vulnerability. It was published on July 29, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2026-54735?

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-2026-54735?

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-2026-54735?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-54735 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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