CVE-2026-54735 — Vulnerability in...

CRITICAL

prebid-server's request forgery vulnerability allows for possible host environment data extraction

Published July 29, 2026Updated August 18, 2026Source: osv

Summary

### Impact Certain bidder adapters accept user-supplied parameters that are interpolated into outbound request URLs. Without proper input validation, a malicious actor could craft bid request parameters that cause the server to send HTTP requests to unintended destinations, potentially exposing internal network services or sensitive server endpoints to unauthorized access. ### Patches Patched in [v4.4.0](https://github.com/prebid/prebid-server/releases/tag/v4.4.0) ### Workarounds If one is unable to update, please make sure that the affected bidder adapters are disabled.

Advisory Timeline

First published July 29, 2026 (75 days ago).
Last revised August 18, 2026 — 20 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Update github.com/prebid/prebid-server/v4 to 4.4.0 or later

go get github.com/prebid/prebid-server/v4@v4.4.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (4)

Affects 1 ecosystem: go (4).

Package	Ecosystem	Affected	Fixed In
github.com/prebid/prebid-server/v3	go	All versions	Range-based data available
github.com/prebid/prebid-server	go	All versions	Range-based data available
github.com/prebid/prebid-server/v2	go	All versions	Range-based data available
github.com/prebid/prebid-server/v4	go	All versions	4.4.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-918
Server-Side Request Forgery (SSRF)MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 10.0 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

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

References

Frequently Asked Questions

What is CVE-2026-54735?: prebid-server's request forgery vulnerability allows for possible host environment data extraction This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 10.0/10).
How do I check if my project is affected by CVE-2026-54735?: CVE-2026-54735 affects github.com/prebid/prebid-server/v3, github.com/prebid/prebid-server and github.com/prebid/prebid-server/v2 (and 1 more). Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-54735 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

10.0

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-4p3g-4hcj-wpvx

GO-2026-6139

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