GHSA-4P3G-4HCJ-WPVX

Vulnerability from github – Published: 2026-07-29 16:00 – Updated: 2026-07-29 16:00
VLAI
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
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{
  "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"
}



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Nomenclature

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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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