CVE-2026-54735: CWE-918: Server-Side Request Forgery (SSRF) in prebid prebid-server
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.
AI Analysis
Technical Summary
CVE-2026-54735 is a critical SSRF vulnerability in prebid-server before version 4.4.0. Certain bidder adapters interpolate user-controlled parameters into outbound URLs without proper validation of host and subdomain values. This allows an attacker to manipulate the server into making HTTP requests to arbitrary internal or external destinations, potentially exposing internal services or sensitive endpoints. The issue is resolved in prebid-server version 4.4.0.
Potential Impact
Successful exploitation can lead to unauthorized server-side requests to arbitrary destinations, potentially exposing internal network services or sensitive server endpoints. The vulnerability has a CVSS 3.1 base score of 10.0, reflecting high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Upgrade prebid-server to version 4.4.0 or later, where this SSRF vulnerability is fixed. No other official remediation or temporary fixes are documented. Patch status is confirmed by the vendor advisory stating the fix is in version 4.4.0.
CVE-2026-54735: CWE-918: Server-Side Request Forgery (SSRF) in prebid prebid-server
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.
CVSS v3.1
Score 10.0critical
Affected software
pkg:github/prebid/prebid-serverRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-54735 is a critical SSRF vulnerability in prebid-server before version 4.4.0. Certain bidder adapters interpolate user-controlled parameters into outbound URLs without proper validation of host and subdomain values. This allows an attacker to manipulate the server into making HTTP requests to arbitrary internal or external destinations, potentially exposing internal services or sensitive endpoints. The issue is resolved in prebid-server version 4.4.0.
Potential Impact
Successful exploitation can lead to unauthorized server-side requests to arbitrary destinations, potentially exposing internal network services or sensitive server endpoints. The vulnerability has a CVSS 3.1 base score of 10.0, reflecting high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Upgrade prebid-server to version 4.4.0 or later, where this SSRF vulnerability is fixed. No other official remediation or temporary fixes are documented. Patch status is confirmed by the vendor advisory stating the fix is in version 4.4.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-15T23:07:33.233Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a6a25599c2644c7f8bbd201
Added to database: 07/29/2026, 16:07:53 UTC
Last enriched: 07/29/2026, 16:22:19 UTC
Last updated: 07/30/2026, 00:33:58 UTC
Views: 9
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