Critical 10.0Published Jul 29, 2026

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

Updated under an hour ago (Oct 27, 2026, 10:20 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for prebid-server

Exploited in the last 30 days

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.

CVSS: 10.0 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 29, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

prebid prebid-server prebid:server (from the name)	before 4.4.0	CNA record
prebid prebid_server prebid:prebid_server	before 4.4.0	NVD

References

References

https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx	x-refsource-confirm, patch, vendor-advisory
https://github.com/prebid/prebid-server/pull/4802	x-refsource-misc, issue-tracking, patch
https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3	x-refsource-misc, patch
https://github.com/prebid/prebid-server/releases/tag/v4.4.0	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.