FKIE_CVE-2026-54734

Vulnerability from fkie_nvd - Published: 2026-09-17 22:17 - Updated: 2026-09-23 18:12
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 Java is the Java version of Prebid Server. Prior to 3.43.0, certain bidder adapters interpolate user-supplied parameters into outbound request URLs without using HttpUtil to validate the resulting domain or path segment. A malicious actor who can supply bid-request parameters can cause the server to send HTTP requests to unintended destinations, potentially reaching internal network services, metadata endpoints, or other sensitive server endpoints with the server's network access. This issue is fixed in version 3.43.0.
References
security-advisories@github.comhttps://github.com/prebid/prebid-server-java/commit/a129a685b6fc54441c1a779ce29ea4ec20c2e09f
security-advisories@github.comhttps://github.com/prebid/prebid-server-java/commit/d0c723ce36aa09712c825ea9625d978f45d29a1c
security-advisories@github.comhttps://github.com/prebid/prebid-server-java/pull/4522
security-advisories@github.comhttps://github.com/prebid/prebid-server-java/releases/tag/3.43.0
security-advisories@github.comhttps://github.com/prebid/prebid-server-java/security/advisories/GHSA-fr2c-g2f8-qchg
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "prebid-server-java",
          "vendor": "prebid",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.43.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Prebid Server Java is the Java version of Prebid Server. Prior to 3.43.0, certain bidder adapters interpolate user-supplied parameters into outbound request URLs without using HttpUtil to validate the resulting domain or path segment. A malicious actor who can supply bid-request parameters can cause the server to send HTTP requests to unintended destinations, potentially reaching internal network services, metadata endpoints, or other sensitive server endpoints with the server\u0027s network access. This issue is fixed in version 3.43.0."
    }
  ],
  "id": "CVE-2026-54734",
  "lastModified": "2026-09-23T18:12:04.247",
  "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-2026-54734",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-18T20:03:13.281651Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-17T22:17:03.317",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/prebid/prebid-server-java/commit/a129a685b6fc54441c1a779ce29ea4ec20c2e09f"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/prebid/prebid-server-java/commit/d0c723ce36aa09712c825ea9625d978f45d29a1c"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/prebid/prebid-server-java/pull/4522"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/prebid/prebid-server-java/releases/tag/3.43.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/prebid/prebid-server-java/security/advisories/GHSA-fr2c-g2f8-qchg"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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