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TI-2026-39546 Aliases CVE-2026-54734

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

Priority MEDIUM 50CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00621 50th percentileScored 2026-11-07
Fix Fixed prebid-server-java (prebid): 3.43.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
prebidprebid-server-javabefore 3.43.03.43.0Patch availableCNA
  • prebid-server-java Vendorprebid Affected before 3.43.0 Fixed in 3.43.0 Patch available CNA

Remediation

  • Fix · CNA prebid-server-java (prebid) Fixed in 3.43.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54734
  2. 2026-11-07 EPSS moved to the 50th–90th percentile

References

Other 5

  • TI-2026-39547 prebid-server's request forgery vulnerability allows for possible host environment data extraction CVSS 3.1CRITICAL 10.0
  • TI-2025-36681 Prebid Universal Creative on npm briefly compromised CVSS 4.0CRITICAL 9.3
  • TI-2025-36680 Prebid.js NPM package briefly compromised CVSS 4.0HIGH 8.6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences