FKIE_CVE-2026-54735

Vulnerability from fkie_nvd - Published: 2026-07-29 16:17 - Updated: 2026-07-29 19:16
Severity
10.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
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.
References
security-advisories@github.comhttps://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3
security-advisories@github.comhttps://github.com/prebid/prebid-server/pull/4802
security-advisories@github.comhttps://github.com/prebid/prebid-server/releases/tag/v4.4.0
security-advisories@github.comhttps://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "prebid-server",
          "vendor": "prebid",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.4.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "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."
    }
  ],
  "id": "CVE-2026-54735",
  "lastModified": "2026-07-29T19:16:47.717",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 10.0,
          "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"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 6.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-54735",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-29T18:04:08.706808Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-29T16:17:54.317",
  "references": [
    {
      "source": "security-advisories@github.com",
      "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"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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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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