CVE-2026-106501 (GCVE-0-2026-106501)

Vulnerability from cvelistv5 – Published: 2026-10-06 21:32 – Updated: 2026-10-06 21:32
VLAI
Title
Backstage: Sensitive information exposure in Scaffolder
Summary
Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder. An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.
Severity
9.6 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-201 - Insertion of Sensitive Information Into Sent Data
Assigner
References
Impacted products
Vendor Product Version CPE status
backstage backstage Affected: < 1.49.6
Affected: >= 1.50.0-next.0, < 1.50.5
Affected: >= 1.51.0-next.0, < 1.54.6
guessed Create a notification for this product.
@backstage plugin-scaffolder-backend Affected: < 3.3.1
Affected: >= 3.4.0, < 3.4.1
Affected: >= 4.0.0, < 4.0.3
Affected: >= 4.0.4, < 4.1.0
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "backstage",
          "vendor": "backstage",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.49.6"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.50.0-next.0, \u003c 1.50.5"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.51.0-next.0, \u003c 1.54.6"
            }
          ]
        },
        {
          "product": "plugin-scaffolder-backend",
          "vendor": "@backstage",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.3.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.4.0, \u003c 3.4.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 4.0.0, \u003c 4.0.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 4.0.4, \u003c 4.1.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder. An authenticated Backstage user who can read another user\u0027s Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.6,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
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              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-201",
              "description": "CWE-201: Insertion of Sensitive Information Into Sent Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-06T21:32:25.997Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/backstage/backstage/security/advisories/GHSA-g2v8-7jhw-pp8p",
          "tags": [
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          "url": "https://github.com/backstage/backstage/security/advisories/GHSA-g2v8-7jhw-pp8p"
        },
        {
          "name": "https://github.com/backstage/backstage/commit/66d2219edf0abe33ab7d0c1ced5d069d1e065be5",
          "tags": [
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          "url": "https://github.com/backstage/backstage/commit/66d2219edf0abe33ab7d0c1ced5d069d1e065be5"
        },
        {
          "name": "https://github.com/backstage/backstage/commit/c19838870476a8e29144c84b1a5ac0654ec20fb5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/backstage/backstage/commit/c19838870476a8e29144c84b1a5ac0654ec20fb5"
        },
        {
          "name": "https://github.com/backstage/backstage/commit/e262d649981ff99bb01ca7077807ae3e25e85560",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/backstage/backstage/commit/e262d649981ff99bb01ca7077807ae3e25e85560"
        },
        {
          "name": "https://github.com/backstage/backstage/releases/tag/v1.49.6",
          "tags": [
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          ],
          "url": "https://github.com/backstage/backstage/releases/tag/v1.49.6"
        },
        {
          "name": "https://github.com/backstage/backstage/releases/tag/v1.50.5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/backstage/backstage/releases/tag/v1.50.5"
        },
        {
          "name": "https://github.com/backstage/backstage/releases/tag/v1.54.6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6"
        }
      ],
      "source": {
        "advisory": "GHSA-g2v8-7jhw-pp8p",
        "discovery": "UNKNOWN"
      },
      "title": "Backstage: Sensitive information exposure in Scaffolder"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-106501",
    "datePublished": "2026-10-06T21:32:25.997Z",
    "dateReserved": "2026-10-06T18:46:47.766Z",
    "dateUpdated": "2026-10-06T21:32:25.997Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-106501",
      "date": "2026-10-07",
      "epss": "0.00473",
      "percentile": "0.38882"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "backstage",
                "vendor": "backstage",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 1.49.6"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 1.50.0-next.0, \u003c 1.50.5"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 1.51.0-next.0, \u003c 1.54.6"
                  }
                ]
              },
              {
                "product": "plugin-scaffolder-backend",
                "vendor": "@backstage",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 3.3.1"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 3.4.0, \u003c 3.4.1"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 4.0.0, \u003c 4.0.3"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 4.0.4, \u003c 4.1.0"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder. An authenticated Backstage user who can read another user\u0027s Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0."
          }
        ],
        "id": "CVE-2026-106501",
        "lastModified": "2026-10-07T13:58:29.527",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 9.6,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
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              },
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              "impactScore": 5.8,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
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        },
        "published": "2026-10-06T22:17:05.217",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/backstage/backstage/commit/66d2219edf0abe33ab7d0c1ced5d069d1e065be5"
          },
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            "url": "https://github.com/backstage/backstage/releases/tag/v1.49.6"
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            "url": "https://github.com/backstage/backstage/releases/tag/v1.50.5"
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            "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6"
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          }
        ],
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        "vulnStatus": "Awaiting Analysis",
        "weaknesses": [
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                "value": "CWE-200"
              },
              {
                "lang": "en",
                "value": "CWE-201"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
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    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-10-07T05:34:10+00:00",
      "cve": "CVE-2026-106501",
      "id": "CVE-2026-106501",
      "initial_release_date": "2026-10-06T21:32:25.997000+00:00",
      "product_status:known_affected": "4",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "@backstage/plugin-scaffolder-backend: Backstage: Sensitive information exposure in Scaffolder",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106501.json",
      "version": "3"
    }
  }
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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