CVE-2026-54734: CWE-918: Server-Side Request Forgery (SSRF) in prebid prebid-server-java
Prebid Server Java is the Java version of Prebid Server. Prior to 3.43.0, certain bidder adapters interpolate user-supplied parameters into outbound request URLs without using HttpUtil to validate the resulting domain or path segment. A malicious actor who can supply bid-request parameters can cause the server to send HTTP requests to unintended destinations, potentially reaching internal network services, metadata endpoints, or other sensitive server endpoints with the server's network access. This issue is fixed in version 3.43.0.
AI Analysis
Technical Summary
Prebid Server Java versions before 3.43.0 contain an SSRF vulnerability (CWE-918) where some bidder adapters incorporate user input into outbound HTTP request URLs without validating the domain or path segments using HttpUtil. This flaw enables an attacker who can control bid-request parameters to induce the server to send HTTP requests to arbitrary destinations, potentially accessing internal network resources or metadata endpoints. The vulnerability is resolved in version 3.43.0.
Potential Impact
An attacker able to supply bid-request parameters can exploit this vulnerability to make the server perform HTTP requests to unintended internal or external destinations. This can lead to unauthorized access to internal network services, metadata endpoints, or other sensitive server resources, potentially compromising confidentiality, integrity, and availability of the system. The CVSS v3.1 score is 10.0 (critical), reflecting the high impact on confidentiality, integrity, and availability with no required privileges or user interaction.
Mitigation Recommendations
Upgrade prebid-server-java to version 3.43.0 or later, where this SSRF vulnerability is fixed. No other mitigations are specified. Patch status is confirmed by the vendor advisory stating the issue is fixed in 3.43.0.
CVE-2026-54734: CWE-918: Server-Side Request Forgery (SSRF) in prebid prebid-server-java
Description
Prebid Server Java is the Java version of Prebid Server. Prior to 3.43.0, certain bidder adapters interpolate user-supplied parameters into outbound request URLs without using HttpUtil to validate the resulting domain or path segment. A malicious actor who can supply bid-request parameters can cause the server to send HTTP requests to unintended destinations, potentially reaching internal network services, metadata endpoints, or other sensitive server endpoints with the server's network access. This issue is fixed in version 3.43.0.
CVSS v3.1
Score 10.0critical
Affected software
prebid
prebid-server-java
pkg:maven/org.prebid/prebid-server-javaRun 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
Prebid Server Java versions before 3.43.0 contain an SSRF vulnerability (CWE-918) where some bidder adapters incorporate user input into outbound HTTP request URLs without validating the domain or path segments using HttpUtil. This flaw enables an attacker who can control bid-request parameters to induce the server to send HTTP requests to arbitrary destinations, potentially accessing internal network resources or metadata endpoints. The vulnerability is resolved in version 3.43.0.
Potential Impact
An attacker able to supply bid-request parameters can exploit this vulnerability to make the server perform HTTP requests to unintended internal or external destinations. This can lead to unauthorized access to internal network services, metadata endpoints, or other sensitive server resources, potentially compromising confidentiality, integrity, and availability of the system. The CVSS v3.1 score is 10.0 (critical), reflecting the high impact on confidentiality, integrity, and availability with no required privileges or user interaction.
Mitigation Recommendations
Upgrade prebid-server-java to version 3.43.0 or later, where this SSRF vulnerability is fixed. No other mitigations are specified. Patch status is confirmed by the vendor advisory stating the issue is fixed in 3.43.0.
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
Threat ID: 6aac671555bf5e2cf5ffd691
Added to database: 09/17/2026, 22:17:57 UTC
Last enriched: 09/17/2026, 22:31:37 UTC
Last updated: 09/18/2026, 02:37:05 UTC
Views: 7
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