CVE-2026-54735
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 3.1
- 10.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - EPSS
- 0.6% chance of exploitation in the next 30 days; higher than 48% of CVEs (scores of 2026-10-25)
- CWE
- CWE-918
- Published
- Modified
- Record from
- the NVD, synced
Affected
- prebid:prebid_server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-4p3g-4hcj-wpvx | Go | github.com/prebid/prebid-server/v4 | <4.4.0 | 4.4.0 |
| GHSA-4p3g-4hcj-wpvx | Go | github.com/prebid/prebid-server/v3 | <=3.30.0 | no fix published |
| GHSA-4p3g-4hcj-wpvx | Go | github.com/prebid/prebid-server/v2 | <=2.32.0 | no fix published |
| GHSA-4p3g-4hcj-wpvx | Go | github.com/prebid/prebid-server | <=0.275.0 | no fix published |
| GO-2026-6139 | Go | github.com/prebid/prebid-server/v4 | <4.4.0 | 4.4.0 |