{"schemaVersion":3,"id":"CVE-2026-54735","aliases":["GHSA-4p3g-4hcj-wpvx","GO-2026-6139"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-07-29T15:59:46.640Z","modified":"2026-07-29T18:04:18.670Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":10,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":10,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Go","score":10,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","exploitability":10,"impact":10,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":10,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00611,"percentile":0.48608,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0.266,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.00345},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00345,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00345,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00345,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00345,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00345,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00345,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00345,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00345,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00345,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00345,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00611,"percentile":0.48608}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.00345,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00345,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00611,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00611,"percentile":0.48608}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-918","name":"Server-Side Request Forgery (SSRF)","description":"The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/918.html"}],"affected":[{"vendor":"github.com/prebid","product":"prebid-server","name":"github.com/prebid/prebid-server","label":"prebid-server","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/prebid/prebid-server","purlType":"golang","versions":[{"text":"≤ 0.275.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 0.275.0","eol":null,"hubHref":null},{"vendor":"github.com/prebid/prebid-server","product":"v2","name":"github.com/prebid/prebid-server/v2","label":"v2","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/prebid/prebid-server/v2","purlType":"golang","versions":[{"text":"≤ 2.32.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 2.32.0","eol":null,"hubHref":null},{"vendor":"github.com/prebid/prebid-server","product":"v3","name":"github.com/prebid/prebid-server/v3","label":"v3","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/prebid/prebid-server/v3","purlType":"golang","versions":[{"text":"≤ 3.30.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 3.30.0","eol":null,"hubHref":null},{"vendor":"github.com/prebid/prebid-server","product":"v4","name":"github.com/prebid/prebid-server/v4","label":"v4","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/prebid/prebid-server/v4","purlType":"golang","versions":[{"text":"< 4.4.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.4.0","eol":null,"hubHref":null},{"vendor":"prebid","product":"prebid_server","name":"prebid server","label":"prebid_server","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 4.4.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.4.0","eol":null,"hubHref":"/vendor/prebid/prebid_server"},{"vendor":"prebid","product":"prebid-server","name":"prebid-server","label":"prebid-server","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 4.4.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.4.0","eol":null,"hubHref":"/vendor/prebid/prebid-server"}],"affectedCount":6,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx","label":"github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx","hostname":"github.com","tags":["X Refsource CONFIRM","WEB","Advisory","Patch","Vendor Advisory"]},{"url":"https://github.com/prebid/prebid-server/pull/4802","label":"github.com/prebid/prebid-server/pull/4802","hostname":"github.com","tags":["X Refsource MISC","WEB","FIX","Issue Tracking","Patch"]},{"url":"https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3","label":"github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3","hostname":"github.com","tags":["X Refsource MISC","WEB","FIX","Patch"]},{"url":"https://github.com/prebid/prebid-server/releases/tag/v4.4.0","label":"github.com/prebid/prebid-server/releases/tag/v4.4.0","hostname":"github.com","tags":["X Refsource MISC","WEB","Product","Release Notes"]},{"url":"https://github.com/prebid/prebid-server","label":"github.com/prebid/prebid-server","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:21761-1","SUSE-SU-2026:23625-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:21761-1","SUSE-SU-2026:23625-1"]},"timeline":[{"kind":"published","date":"2026-07-29T15:59:46.640Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-07-29T18:04:18.670Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T14:06:48.864Z","stale":false,"partial":false}}