CVE-2026-54735
prebid-server's request forgery vulnerability allows for possible host environment data extraction
CVSS Score
10.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-918 |
| Vendor | prebid |
| Product | prebid-server |
| Published | Jul 29, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
prebid / prebid-server
< 4.4.0
References
github.com: https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx github.com: https://github.com/prebid/prebid-server/pull/4802 github.com: https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3 github.com: https://github.com/prebid/prebid-server/releases/tag/v4.4.0