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CVE-2026-54735— prebid-server's request forgery vulnerability allows for possible host environment data extraction

Quick assessment

Affected
prebid prebid-server
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Prebid Prebid Server是Prebid组织开源的一款开源服务端实时广告竞价引擎，将Header Bidding拍卖从浏览器移至云端运行。 Prebid Server 4.4.0之前版本存在服务端请求伪造漏洞，该漏洞源于bidder适配器将用户提供的参数插入出站请求URL时未正确验证主机和子域值，可能导致特制请求参数导致服务端请求到非预期目的地，暴露内部网络服务或敏感端点。

CVSS 10.0 · Critical EPSS 0.61% · P48

Affected Version Matrix 1

VendorProduct Version RangeStatus
prebid prebid-server < 4.4.0 affected
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I. Basic Information for CVE-2026-54735

Vulnerability Information
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Vulnerability Title
prebid-server's request forgery vulnerability allows for possible host environment data extraction
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Prebid Server 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Prebid Prebid Server是Prebid组织开源的一款开源服务端实时广告竞价引擎，将Header Bidding拍卖从浏览器移至云端运行。 Prebid Server 4.4.0之前版本存在服务端请求伪造漏洞，该漏洞源于bidder适配器将用户提供的参数插入出站请求URL时未正确验证主机和子域值，可能导致特制请求参数导致服务端请求到非预期目的地，暴露内部网络服务或敏感端点。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
prebid prebid-server < 4.4.0 -

II. Public POCs for CVE-2026-54735

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7544 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-54735

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Patches & Fixes for CVE-2026-54735 (1)

Vendor Advisories for CVE-2026-54735 (1)

Vendor Pages for CVE-2026-54735 (1)

IV. Related Vulnerabilities

Same vendor: prebid
Same weakness: CWE-918

V. Comments for CVE-2026-54735

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