CVE WatchJul 29, 2026

CVE-2026-54735

Prebid Server is an open-source solution for running real-time advertising auctions in the cloud. Prior to version 4.4.0, certain bidder ada

CVSS

10.0

Critical

EPSS

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KEV

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Exploit Today

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0-100

Published: Jul 29, 2026 · Last modified: Jul 29, 2026 · CWE-918

EPSS · 30d

Not enough EPSS history yet.

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.

Official references

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