CVE-2026-54734

CRITICAL 10.0

Prebid Server Java: Vulnerability to request forgery allows for possible host environment data extraction

CVSS Score

10.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-918
Vendor	prebid
Product	prebid-server-java
Published	Sep 17, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

prebid / prebid-server-java

< 3.43.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/prebid/prebid-server-java/security/advisories/GHSA-fr2c-g2f8-qchg github.com: https://github.com/prebid/prebid-server-java/pull/4522 github.com: https://github.com/prebid/prebid-server-java/commit/a129a685b6fc54441c1a779ce29ea4ec20c2e09f github.com: https://github.com/prebid/prebid-server-java/commit/d0c723ce36aa09712c825ea9625d978f45d29a1c github.com: https://github.com/prebid/prebid-server-java/releases/tag/3.43.0