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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54735
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-29 16:17:54 UTC
Updated2026-07-29 19:16:47 UTC
DescriptionPrebid 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.

Risk And Classification

Primary CVSS: v3.1 10 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Problem Types: CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary10CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED10CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Prebid Prebid-server affected < 4.4.0 Not specified

References

ReferenceSourceLinkTags
github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx [email protected] github.com
github.com/prebid/prebid-server/releases/tag/v4.4.0 [email protected] github.com
github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff9... [email protected] github.com
github.com/prebid/prebid-server/pull/4802 [email protected] github.com
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