Log in Start free

Vulnerability · Published Jul 29, 2026 · Assigned by GitHub_M

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

Critical 10.0

In plain English

A critical-severity server-side request forgery in prebid-server from prebid. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)10.0Critical
Exploit odds (30 days)0.6%top 50.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/prebid/prebid-serverno fix listedGHSA-4p3g-4hcj-wpvx
Gogithub.com/prebid/prebid-server/v2no fix listedGHSA-4p3g-4hcj-wpvx
Gogithub.com/prebid/prebid-server/v3no fix listedGHSA-4p3g-4hcj-wpvx
Gogithub.com/prebid/prebid-server/v44.4.0GHSA-4p3g-4hcj-wpvx
Gogithub.com/prebid/prebid-server/v44.4.0GO-2026-6139

Affected products (as reported)

VendorProductVersions
prebid prebid-server < 4.4.0

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References