CVE-2026-106500 (GCVE-0-2026-106500)

Vulnerability from cvelistv5 – Published: 2026-10-06 21:29 – Updated: 2026-10-06 21:29
VLAI
Title
Backstage: Improper task state validation in Scaffolder backend
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 improper task state validation in scaffolder backend. An authenticated user with permission to create and access Scaffolder tasks may, under specific timing and deployment conditions, affect files accessible to the Backstage backend. If backend application files are writable, the confidentiality, integrity, and availability of the backend may be compromised. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.
Severity
8.5 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE
  • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
  • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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"
            },
            {
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              "version": "\u003e= 4.0.4, \u003c 4.1.0"
            }
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      ],
      "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 improper task state validation in scaffolder backend. An authenticated user with permission to create and access Scaffolder tasks may, under specific timing and deployment conditions, affect files accessible to the Backstage backend. If backend application files are writable, the confidentiality, integrity, and availability of the backend may be compromised. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
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      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-59",
              "description": "CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-362",
              "description": "CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-06T21:29:10.626Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
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          "name": "https://github.com/backstage/backstage/security/advisories/GHSA-xvgh-hmx8-9xxf",
          "tags": [
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          "url": "https://github.com/backstage/backstage/security/advisories/GHSA-xvgh-hmx8-9xxf"
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          "tags": [
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          "url": "https://github.com/backstage/backstage/commit/0d24f1b8701f3dde6cd597f81997c1ea873a43ae"
        },
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          "tags": [
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          ],
          "url": "https://github.com/backstage/backstage/commit/56be299dd3ef6706e13e76ea2f8a9b0dd0b6413d"
        },
        {
          "name": "https://github.com/backstage/backstage/commit/9e86c95a1a3ddfd54db03731cd8678aa63495175",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/backstage/backstage/commit/9e86c95a1a3ddfd54db03731cd8678aa63495175"
        },
        {
          "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"
        },
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          "name": "https://github.com/backstage/backstage/releases/tag/v1.50.5",
          "tags": [
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        },
        {
          "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-xvgh-hmx8-9xxf",
        "discovery": "UNKNOWN"
      },
      "title": "Backstage: Improper task state validation in Scaffolder backend"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-106500",
    "datePublished": "2026-10-06T21:29:10.626Z",
    "dateReserved": "2026-10-06T18:46:47.766Z",
    "dateUpdated": "2026-10-06T21:29:10.626Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-106500",
      "date": "2026-10-07",
      "epss": "0.00328",
      "percentile": "0.23891"
    },
    "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",
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                  },
                  {
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                    "version": "\u003e= 3.4.0, \u003c 3.4.1"
                  },
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                    "version": "\u003e= 4.0.0, \u003c 4.0.3"
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                    "version": "\u003e= 4.0.4, \u003c 4.1.0"
                  }
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
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          }
        ],
        "id": "CVE-2026-106500",
        "lastModified": "2026-10-07T13:58:29.527",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
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                "attackVector": "NETWORK",
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                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
                "version": "3.1"
              },
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              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
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        },
        "published": "2026-10-06T22:17:05.060",
        "references": [
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            "source": "security-advisories@github.com",
            "url": "https://github.com/backstage/backstage/commit/0d24f1b8701f3dde6cd597f81997c1ea873a43ae"
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            "url": "https://github.com/backstage/backstage/releases/tag/v1.49.6"
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          }
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        "vulnStatus": "Awaiting Analysis",
        "weaknesses": [
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            "description": [
              {
                "lang": "en",
                "value": "CWE-59"
              },
              {
                "lang": "en",
                "value": "CWE-362"
              }
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            "source": "security-advisories@github.com",
            "type": "Primary"
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    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-10-07T05:53:15+00:00",
      "cve": "CVE-2026-106500",
      "id": "CVE-2026-106500",
      "initial_release_date": "2026-10-06T21:29:10.626000+00:00",
      "product_status:known_affected": "4",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "@backstage/plugin-scaffolder-backend: @backstage/plugin-scaffolder-backend: Unauthorized file manipulation via improper task state validation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106500.json",
      "version": "3"
    }
  }
}



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Nomenclature

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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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