CVE-2026-54735

CRITICAL10.0

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

Published Jul 29, 2026

Modified 3 weeks ago

Details

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.

References

WEB

https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3

WEB

https://github.com/prebid/prebid-server/pull/4802

WEB

https://github.com/prebid/prebid-server/releases/tag/v4.4.0

WEB

https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-54735

CVSS Analysis