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CVE-2026-54734— Prebid Server Java: Vulnerability to request forgery allows for possible host environment data extraction

Quick assessment

Affected
prebid prebid-server-java
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Prebid Server Java 是 Prebid Server 的 Java 版本。在 3.43.0 版本之前，某些竞价者适配器（bidder adapters）会将用户提供的参数直接插入到出站请求的 URL 中，而未使用 HttpUtil 来验证生成的域名或路径片段。能够控制竞价请求参数（bid-request parameters）的攻击者可以诱导服务器向非预期目标发送 HTTP 请求，这些请求可能到达内部网络服务、元数据端点或其他具有服务器网络访问权限的敏感服务器端点。该问题已在 3.43.0 版本中修

CVSS 10.0 · Critical
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I. Basic Information for CVE-2026-54734

Vulnerability Information
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Vulnerability Title
Prebid Server Java: Vulnerability to request forgery allows for possible host environment data extraction
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
prebid prebid-server-java < 3.43.0 -

II. Public POCs for CVE-2026-54734

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III. Intelligence Information for CVE-2026-54734

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Patches & Fixes for CVE-2026-54734 (2)

Other References for CVE-2026-54734 (2)

IV. Related Vulnerabilities

Same vendor: prebid
Same weakness: CWE-918

V. Comments for CVE-2026-54734

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