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10.0

Prebid Server Java can be tricked into sending unwanted requests

CVE-2026-54734 · published 24 days ago
Summary

The Java version of Prebid Server can be made to contact internal or sensitive URLs when an attacker supplies crafted bid parameters. This could expose internal network data or services to the outside. Upgrade to version 3.43.0 or later to stop the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
prebid prebid-server-java < 3.43.0
Original advisory text
Prebid Server Java: Vulnerability to request forgery allows for possible host environment data extraction
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.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
10.0 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-918Server-Side Request Forgery (SSRF)
Timeline
Published17 Sep 2026
Updated11 Oct 2026
First seen17 Sep 2026
Sources
CVE-2026-54734 · NVD
CVE-2026-54734 · MITRE
CVE-2026-54734 · OSV
GHSA-fr2c-g2f8-qchg · GHSA
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