September 20, 2026

CVE Watchtower

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CVE-2026-54734NVD

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.
Severity Level
CRITICAL (10.0)
Published Date
17/09/2026
Last Modified
18/09/2026
Exploitation Status
????
EPSS Score
0.36% (percentile 30.1%)

CVSS Base Metrics

CVSS v3 (3.1)
CRITICAL 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weaknesses (CWE)

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

Affected & Patched Versions

ProductAffected VersionsPatched Version
prebid prebid-server-java< 3.43.0N/A
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📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
⚙️Custom EPSS — Filter noise, focus on risk.
💬Webhooks — Slack & Teams integration.
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References