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 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.

CVSS v3 10.0 CRITICAL

10.0^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3
https://github.com/prebid/prebid-server/pull/4802
https://github.com/prebid/prebid-server/releases/tag/v4.4.0
https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx

Configurations

No configuration.

History

29 Jul 2026, 16:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-29 16:17

Updated : 2026-07-30 20:06

NVD link : CVE-2026-54735

Mitre link : CVE-2026-54735

CVE.ORG link : CVE-2026-54735

JSON object : View

Products Affected

No product.

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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