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TI-2026-39547 Aliases CVE-2026-54735GHSA-4p3g-4hcj-wpvx

prebid-server's request forgery vulnerability 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 and GitHub.

Summary

Prebid Server is an open-source solution for running real-time advertising auctions in the cloud. Prior to version 4.4.0, certain bidder adapters in Prebid Server interpolate user-supplied parameters into outbound request URLs without properly validating host and subdomain values, allowing crafted bid request parameters to cause server-side requests to unintended destinations and potentially expose internal network services or sensitive server endpoints. This issue is fixed in version 4.4.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00611 49th percentileScored 2026-11-07
Fix Fixed prebid-server (prebid): 4.4.0github.com/prebid/prebid-server/v4 (Go): 4.4.0

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-serverbefore 4.4.04.4.0Patch availableCNA
—github.com/prebid/prebid-server/v4 (Go)before 4.4.04.4.0Patch availableGHSA-4p3g-4hcj-wpvx
—github.com/prebid/prebid-server/v3 (Go)up to 3.30.0—No fix listedGHSA-4p3g-4hcj-wpvx
—github.com/prebid/prebid-server/v2 (Go)up to 2.32.0—No fix listedGHSA-4p3g-4hcj-wpvx
—github.com/prebid/prebid-server (Go)up to 0.275.0—No fix listedGHSA-4p3g-4hcj-wpvx
  • prebid-server Vendorprebid Affected before 4.4.0 Fixed in 4.4.0 Patch available CNA
  • github.com/prebid/prebid-server/v4 (Go) Vendor— Affected before 4.4.0 Fixed in 4.4.0 Patch available GHSA-4p3g-4hcj-wpvx
  • github.com/prebid/prebid-server/v3 (Go) Vendor— Affected up to 3.30.0 Fixed in — No fix listed GHSA-4p3g-4hcj-wpvx
  • github.com/prebid/prebid-server/v2 (Go) Vendor— Affected up to 2.32.0 Fixed in — No fix listed GHSA-4p3g-4hcj-wpvx
  • github.com/prebid/prebid-server (Go) Vendor— Affected up to 0.275.0 Fixed in — No fix listed GHSA-4p3g-4hcj-wpvx

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:prebid:prebid_server:*:*:*:*:*:go:*:*before 4.4.0Vulnerableprebid
  • cpe:2.3:a:prebid:prebid_server:*:*:*:*:*:go:*:* Versions before 4.4.0 Vulnerable ·prebid

Remediation

  • Fix · CNA prebid-server (prebid) Fixed in 4.4.0
  • Fix · GHSA-4p3g-4hcj-wpvx github.com/prebid/prebid-server/v4 (Go) Fixed in 4.4.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54735
  2. 2026-10-03 Alias added: GHSA-4p3g-4hcj-wpvx

References

Patch 3

Other 2

Sources

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