Is CVE-2026-54735 actively exploited?

No active exploitation of CVE-2026-54735 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-54735 be exploited remotely?

Yes. CVE-2026-54735 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-54735?

CVE-2026-54735 has a CVSS score of 10.0 (CRITICAL).

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CRITICAL

CVE-2026-54735

CWE-918Published: July 29, 2026· Updated: Jul 29, 2026

10.0

CVSS v3.1

Official 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.

NVD Source

Risk Analysis

Prebid Server contains a server-side request forgery (SSRF) vulnerability where bidder adapters fail to validate user-supplied URLs. This allows attackers to interact with internal network services, which is highly critical given the 10.0 CVSS score.

This is a remotely exploitable flaw with low complexity, but no public exploit is currently known and it is not in the CISA KEV catalog.

Recommended Action

Upgrade to Prebid Server version 4.4.0 or later to ensure proper validation of host and subdomain parameters.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-54735 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 10.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.