GHSA-4p3g-4hcj-wpvx: prebid-server's request forgery vulnerability allows for possible host environment data extraction

criticalCVSS 10CVE-2026-54735

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 Workarounds If one is unable to update, please make sure that the affected bidder adapters are disabled.

Details

Source: GitHub Security Advisories (INTL · database · site)
Severity: critical — CVSS 10
Published: 2026-07-29
Last updated: 2026-07-29
Exploitation: Not in CISA KEV at last sync

Original advisory: https://github.com/advisories/GHSA-4p3g-4hcj-wpvx

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-547350.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-54735	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

criticalCVE-2026-54735: Prebid Server is an open-source solution for running real-time advertising auctions in the clo…nvd

GHSA-4p3g-4hcj-wpvx: prebid-server's request forgery vulnerability allows for possible host environment data extraction

Details

Exploitation outlook

Referenced CVEs

Same CVEs, other sources

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