Vulnerability-Lookup

CVE-2026-54735 (GCVE-0-2026-54735)

Vulnerability from cvelistv5 – Published: 2026-07-29 15:59 – Updated: 2026-07-29 15:59

Title

prebid-server's request forgery vulnerability allows for possible host environment data extraction

Summary

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.

Severity

10 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

4 references

URL	Tags
https://github.com/prebid/prebid-server/security/…	x_refsource_CONFIRM
https://github.com/prebid/prebid-server/pull/4802	x_refsource_MISC
https://github.com/prebid/prebid-server/commit/49…	x_refsource_MISC
https://github.com/prebid/prebid-server/releases/…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
prebid	prebid-server	Affected: < 4.4.0

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "prebid-server",
          "vendor": "prebid",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.4.0"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "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",
              "description": "CWE-918: Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-29T15:59:46.640Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx"
        },
        {
          "name": "https://github.com/prebid/prebid-server/pull/4802",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/prebid/prebid-server/pull/4802"
        },
        {
          "name": "https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3"
        },
        {
          "name": "https://github.com/prebid/prebid-server/releases/tag/v4.4.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/prebid/prebid-server/releases/tag/v4.4.0"
        }
      ],
      "source": {
        "advisory": "GHSA-4p3g-4hcj-wpvx",
        "discovery": "UNKNOWN"
      },
      "title": "prebid-server\u0027s request forgery vulnerability allows for possible host environment data extraction"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54735",
    "datePublished": "2026-07-29T15:59:46.640Z",
    "dateReserved": "2026-06-15T23:07:33.233Z",
    "dateUpdated": "2026-07-29T15:59:46.640Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-54735\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-07-29T16:17:54.317\",\"lastModified\":\"2026-07-29T16:17:54.317\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"prebid\",\"product\":\"prebid-server\",\"versions\":[{\"version\":\"\u003c 4.4.0\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":10.0,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":6.0}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-918\"}]}],\"references\":[{\"url\":\"https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/prebid/prebid-server/pull/4802\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/prebid/prebid-server/releases/tag/v4.4.0\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx\",\"source\":\"security-advisories@github.com\"}]}}",
    "vulnrichment": {
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}

GHSA-4P3G-4HCJ-WPVX

Vulnerability from github – Published: 2026-07-29 16:00 – Updated: 2026-07-29 16:00

Summary

prebid-server's request forgery vulnerability allows for possible host environment data extraction

Details

Impact

Certain bidder adapters accept user-supplied parameters that are interpolated into outbound request URLs. Without proper input validation, a malicious actor could craft bid request parameters that cause the server to send HTTP requests to unintended destinations, potentially exposing internal network services or sensitive server endpoints to unauthorized access.

Patches

Patched in v4.4.0

Workarounds

If one is unable to update, please make sure that the affected bidder adapters are disabled.

Severity

10.0 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/prebid/prebid-server/v4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.4.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/prebid/prebid-server/v3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "3.30.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/prebid/prebid-server/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2.32.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/prebid/prebid-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.275.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54735"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-29T16:00:36Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "### Impact\nCertain bidder adapters accept user-supplied parameters that are interpolated into outbound request URLs. Without proper input validation, a malicious actor could craft bid request parameters that cause the server to send HTTP requests to unintended destinations, potentially exposing internal network services or sensitive server endpoints to unauthorized access.\n\n### Patches\nPatched in [v4.4.0](https://github.com/prebid/prebid-server/releases/tag/v4.4.0)\n\n### Workarounds\nIf one is unable to update, please make sure that the affected bidder adapters are disabled.",
  "id": "GHSA-4p3g-4hcj-wpvx",
  "modified": "2026-07-29T16:00:36Z",
  "published": "2026-07-29T16:00:36Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx"
    },
    {
      "type": "WEB",
      "url": "https://github.com/prebid/prebid-server/pull/4802"
    },
    {
      "type": "WEB",
      "url": "https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/prebid/prebid-server"
    },
    {
      "type": "WEB",
      "url": "https://github.com/prebid/prebid-server/releases/tag/v4.4.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "prebid-server\u0027s request forgery vulnerability allows for possible host environment data extraction"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

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