{"cve":"CVE-2026-54735","nvd":{"published":"2026-07-29T16:17:54.317","modified":"2026-10-23T23:10:00.157","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","score":10.0},"cwes":["CWE-918"],"references":["https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3","https://github.com/prebid/prebid-server/pull/4802","https://github.com/prebid/prebid-server/releases/tag/v4.4.0","https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx"],"products":["prebid:prebid_server"],"source":"nvd","synced_at":"2026-10-24T16:53:27.712498749+00:00"},"epss":{"cve":"CVE-2026-54735","score":0.00611,"percentile":0.48989,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-4p3g-4hcj-wpvx","url":"https://osv.dev/vulnerability/GHSA-4p3g-4hcj-wpvx","summary":"prebid-server's request forgery vulnerability allows for possible host environment data extraction","modified":"2026-08-18T17:23:47.704399899Z","packages":[{"ecosystem":"Go","name":"github.com/prebid/prebid-server/v4","purl":"pkg:golang/github.com/prebid/prebid-server/v4","ranges":["<4.4.0"],"fixed":["4.4.0"]},{"ecosystem":"Go","name":"github.com/prebid/prebid-server/v3","purl":"pkg:golang/github.com/prebid/prebid-server/v3","ranges":["<=3.30.0"],"fixed":[]},{"ecosystem":"Go","name":"github.com/prebid/prebid-server/v2","purl":"pkg:golang/github.com/prebid/prebid-server/v2","ranges":["<=2.32.0"],"fixed":[]},{"ecosystem":"Go","name":"github.com/prebid/prebid-server","purl":"pkg:golang/github.com/prebid/prebid-server","ranges":["<=0.275.0"],"fixed":[]}]},{"id":"GO-2026-6139","url":"https://osv.dev/vulnerability/GO-2026-6139","summary":"Server-side request forgery in bidder adapters in github.com/prebid/prebid-server/v4","modified":"2026-08-18T17:15:27.926496030Z","packages":[{"ecosystem":"Go","name":"github.com/prebid/prebid-server/v4","purl":"pkg:golang/github.com/prebid/prebid-server/v4","ranges":["<4.4.0"],"fixed":["4.4.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}