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Vulnerability record · CVE-2026-54734 · published 17 September 2026

CVE-2026-54734: Server-side request forgery (SSRF) vulnerability

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.

10.0 CVSS 3.1 Critical EPSS 0.62% · top 52.4% CWE-918 · Server-side request forgery (SSRF) Awaiting Analysis
10.0CVSS 3.1 base score
0.62%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
23 Sep 2026Last modified by NVD

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

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-54734), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.