{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.121.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "69430e7f627b3e62c8999312c06949267fab813a"
            },
            {
              "fixed": "a49a25bc2e0d6e220a131a4dc58f38ebe6ae851b"
            },
            {
              "fixed": "22da667c047765788a5cb8b01c1e8ad4cb87fc0a"
            },
            {
              "fixed": "f5fc438c9a237847964aa561b5a593aa622f91df"
            }
          ],
          "repo": "https://github.com/opencost/opencost",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-wmj8-9953-vff5"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-20",
      "CWE-309"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44300.json"
  },
  "details": "OpenCost provides cost monitoring for Kubernetes workloads and cloud costs. Prior to 1.121.0, the POST /serviceKey endpoint in pkg/costmodel/router.go allows a network client to invoke AddServiceKey without mandatory authentication and submit an arbitrary key form value that is written to the GCP service-account key.json file returned by GetGCPAuthSecretFilePath in core/pkg/env/core.go. The attacker controls the file contents but not the CONFIG_PATH-derived directory, the key.json filename, or the file mode. Replacing the credential contents can disrupt GCP cost collection or cause OpenCost to use attacker-selected credentials, and the wildcard Access-Control-Allow-Origin response permits browser-assisted requests when the service is reachable from a browser. This issue is fixed in version 1.121.0.",
  "id": "CVE-2026-44300",
  "modified": "2026-09-17T03:30:55.731794525Z",
  "published": "2026-09-15T17:08:15.845Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/opencost/opencost/releases/tag/v1.120.0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opencost/opencost/releases/tag/v1.121.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44300.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/opencost/opencost/security/advisories/GHSA-wmj8-9953-vff5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44300"
    },
    {
      "type": "FIX",
      "url": "https://github.com/opencost/opencost/commit/69430e7f627b3e62c8999312c06949267fab813a"
    },
    {
      "type": "FIX",
      "url": "https://github.com/opencost/opencost/commit/a49a25bc2e0d6e220a131a4dc58f38ebe6ae851b"
    },
    {
      "type": "FIX",
      "url": "https://github.com/opencost/opencost/pull/3651"
    },
    {
      "type": "FIX",
      "url": "https://github.com/opencost/opencost/pull/3910"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OpenCost ServiceKey Endpoint Unauthorized Credential Overwrite/Injection"
}