{"id":"CVE-2026-54735","state":"PUBLISHED","title":"prebid-server's request forgery vulnerability allows for possible host environment data extraction","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.","publishedAt":"2026-07-29T15:59:46.640Z","updatedAt":"2026-07-29T18:04:18.670Z","severity":{"score":10,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["prebid prebid-server"],"affected":[{"vendor":"prebid","product":"prebid-server","versions":[{"version":"< 4.4.0","status":"affected"}]}],"references":["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"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/54xxx/CVE-2026-54735.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54735","state":"PUBLISHED","datePublished":"2026-07-29T15:59:46.640Z","dateUpdated":"2026-07-29T18:04:18.670Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-15T23:07:33.233Z"},"containers":{"cna":{"title":"prebid-server's request forgery vulnerability allows for possible host environment data extraction","descriptions":[{"lang":"en","value":"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":[{"vendor":"prebid","product":"prebid-server","versions":[{"version":"< 4.4.0","status":"affected"}]}],"references":[{"url":"https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx","name":"https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/prebid/prebid-server/pull/4802","name":"https://github.com/prebid/prebid-server/pull/4802","tags":["x_refsource_MISC"]},{"url":"https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3","name":"https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3","tags":["x_refsource_MISC"]},{"url":"https://github.com/prebid/prebid-server/releases/tag/v4.4.0","name":"https://github.com/prebid/prebid-server/releases/tag/v4.4.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-29T15:59:46.640Z"},"source":{"advisory":"GHSA-4p3g-4hcj-wpvx","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-29T18:04:08.706808Z","id":"CVE-2026-54735","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-29T18:04:18.670Z"}}]}}}