CVE-2026-54734
Prebid Server Java: Vulnerability to request forgery allows for possible host environment data extraction
- State
- Published
- Severity
- 10.0 Critical
- Published
- Sep 17, 2026
- Updated
- Sep 18, 2026
- Reserved
- Jun 15, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 10.0 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H | GitHub_M |
Weaknesses
- CWE-918 Server-Side Request Forgery (SSRF)
Affected Products
| Product | Versions |
|---|---|
prebid-server-javaprebid |
|
References
- https://github.com/prebid/prebid-server-java/security/advisories/GHSA-fr2c-g2f8-qchg
- https://github.com/prebid/prebid-server-java/pull/4522
- https://github.com/prebid/prebid-server-java/commit/a129a685b6fc54441c1a779ce29ea4ec20c2e09f
- https://github.com/prebid/prebid-server-java/commit/d0c723ce36aa09712c825ea9625d978f45d29a1c
- https://github.com/prebid/prebid-server-java/releases/tag/3.43.0
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