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Vulnerabilities CVE-2026-54735

CVE-2026-54735

Critical
Open
TLP:CLEAR

prebid-server's request forgery vulnerability allows for possible host environment data extraction

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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.

Details

CVSS Score
10.0
EPSS Score
0.35%

28th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Confidence
90%
Published
Jul 29, 2026
Last Modified
Jul 29, 2026
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