{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "FastGPT",
          "vendor": "labring",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.15.0-beta5"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "FastGPT is an open source AI knowledge base platform. Prior to v4.15.0-beta5, two FastGPT file handlers authorize an unrelated resource and then sign or read an S3 object using a key taken directly from the request, without checking that the key belongs to the caller\u0027s team. Because S3 object keys are global within the bucket and carry the tenant id only as a path segment, an attacker can supply another team\u0027s key and obtain its file contents through the chat-file presign endpoint or dataset preview endpoint. This issue is fixed in version v4.15.0-beta5."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-639",
              "description": "CWE-639: Authorization Bypass Through User-Controlled Key",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-07T21:18:45.315Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/labring/FastGPT/security/advisories/GHSA-6rxv-p43w-mmx5",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/labring/FastGPT/security/advisories/GHSA-6rxv-p43w-mmx5"
        },
        {
          "name": "https://github.com/labring/FastGPT/pull/7104",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/labring/FastGPT/pull/7104"
        },
        {
          "name": "https://github.com/labring/FastGPT/commit/decb6d2fb1417fb9e2bca145d2dcc9cbcf06396c",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/labring/FastGPT/commit/decb6d2fb1417fb9e2bca145d2dcc9cbcf06396c"
        },
        {
          "name": "https://github.com/labring/FastGPT/releases/tag/v4.15.0-beta5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/labring/FastGPT/releases/tag/v4.15.0-beta5"
        }
      ],
      "source": {
        "advisory": "GHSA-6rxv-p43w-mmx5",
        "discovery": "UNKNOWN"
      },
      "title": "FastGPT: S3 presign/read handlers do not bind the object key to the caller\u0027s team (cross-team file disclosure)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55418",
    "datePublished": "2026-07-07T21:18:45.315Z",
    "dateReserved": "2026-06-16T21:48:43.125Z",
    "dateUpdated": "2026-07-07T21:18:45.315Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-55418",
      "date": "2026-07-08",
      "epss": "0.00299",
      "percentile": "0.21616"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-55418\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-07-07T22:16:53.930\",\"lastModified\":\"2026-07-08T15:07:57.380\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"FastGPT is an open source AI knowledge base platform. Prior to v4.15.0-beta5, two FastGPT file handlers authorize an unrelated resource and then sign or read an S3 object using a key taken directly from the request, without checking that the key belongs to the caller\u0027s team. Because S3 object keys are global within the bucket and carry the tenant id only as a path segment, an attacker can supply another team\u0027s key and obtain its file contents through the chat-file presign endpoint or dataset preview endpoint. This issue is fixed in version v4.15.0-beta5.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"labring\",\"product\":\"FastGPT\",\"versions\":[{\"version\":\"\u003c 4.15.0-beta5\",\"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:N/A:N\",\"baseScore\":8.6,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":4.0}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-639\"}]}],\"references\":[{\"url\":\"https://github.com/labring/FastGPT/commit/decb6d2fb1417fb9e2bca145d2dcc9cbcf06396c\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/labring/FastGPT/pull/7104\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/labring/FastGPT/releases/tag/v4.15.0-beta5\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/labring/FastGPT/security/advisories/GHSA-6rxv-p43w-mmx5\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}