critical10.0
CVE-2026-54735
prebid-server's request forgery vulnerability allows for possible host environment data extraction
Impact
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
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/prebid/prebid-server/v4 | < 4.4.0 | 4.4.0 |
| go | github.com/prebid/prebid-server/v3 | <= 3.30.0 | none recorded |
| go | github.com/prebid/prebid-server/v2 | <= 2.32.0 | none recorded |
| go | github.com/prebid/prebid-server | <= 0.275.0 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Prebid | Prebid Server | before 4.4.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-4p3g-4hcj-wpvx
- https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx
- https://github.com/prebid/prebid-server/pull/4802
- https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3
- https://github.com/prebid/prebid-server/releases/tag/v4.4.0