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    4 vulnerabilities found for backend-defaults by @backstage

    CVE-2026-106494 (GCVE-0-2026-106494)

    Vulnerability from nvd – Published: 2026-10-06 20:54 – Updated: 2026-10-07 15:32
    VLAI
    Title
    Backstage: Improper input validation in cloud storage URL readers
    Summary
    Backstage is an open framework for building developer portals. Prior to 0.17.8, the @backstage/backend-defaults package is affected by improper input validation in cloud storage url readers. An attacker with write access to a cloud storage bucket used by Backstage could craft object names that could collide with protected files in the output directory. In certain deployment configurations, this could lead to content injection. This issue is fixed in version 0.17.8.
    Severity
    4.4 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-10-07 15:31 UTC
    CWE
    • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
    • CWE-73 - External Control of File Name or Path
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7628 records in the last 180 days details
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2026-106492 (GCVE-0-2026-106492)

    Vulnerability from nvd – Published: 2026-10-06 20:48 – Updated: 2026-10-09 01:51
    VLAI
    Title
    Backstage: Improper preservation of access restrictions during service credential delegation
    Summary
    Backstage is an open framework for building developer portals. Prior to 0.16.1 and 0.17.8, the @backstage/backend-defaults package is affected by improper preservation of access restrictions during service credential delegation. An external service credential configured with access restrictions (e.g., read-only) could bypass those restrictions by routing requests through plugin delegation paths. This could allow a restricted service to perform operations beyond its intended scope, including write operations on plugins it was restricted to read-only access for. This issue is fixed in versions 0.16.1 and 0.17.8.
    Severity
    7.6 (High)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-10-09 01:50 UTC
    CWE
    • CWE-269 - Improper Privilege Management
    • CWE-863 - Incorrect Authorization
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7628 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    backstage backstage Affected: < 1.49.6
    Affected: >= 1.50.0-next.0, < 1.54.6
    		Create a notification for this product.
    @backstage backend-defaults Affected: < 0.16.1
    Affected: >= 0.17.0, < 0.17.8
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-106494 (GCVE-0-2026-106494)

    Vulnerability from cvelistv5 – Published: 2026-10-06 20:54 – Updated: 2026-10-07 15:32
    VLAI
    Title
    Backstage: Improper input validation in cloud storage URL readers
    Summary
    Backstage is an open framework for building developer portals. Prior to 0.17.8, the @backstage/backend-defaults package is affected by improper input validation in cloud storage url readers. An attacker with write access to a cloud storage bucket used by Backstage could craft object names that could collide with protected files in the output directory. In certain deployment configurations, this could lead to content injection. This issue is fixed in version 0.17.8.
    Severity
    4.4 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-10-07 15:31 UTC
    CWE
    • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
    • CWE-73 - External Control of File Name or Path
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7628 records in the last 180 days details
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2026-106492 (GCVE-0-2026-106492)

    Vulnerability from cvelistv5 – Published: 2026-10-06 20:48 – Updated: 2026-10-09 01:51
    VLAI
    Title
    Backstage: Improper preservation of access restrictions during service credential delegation
    Summary
    Backstage is an open framework for building developer portals. Prior to 0.16.1 and 0.17.8, the @backstage/backend-defaults package is affected by improper preservation of access restrictions during service credential delegation. An external service credential configured with access restrictions (e.g., read-only) could bypass those restrictions by routing requests through plugin delegation paths. This could allow a restricted service to perform operations beyond its intended scope, including write operations on plugins it was restricted to read-only access for. This issue is fixed in versions 0.16.1 and 0.17.8.
    Severity
    7.6 (High)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-10-09 01:50 UTC
    CWE
    • CWE-269 - Improper Privilege Management
    • CWE-863 - Incorrect Authorization
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7628 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    backstage backstage Affected: < 1.49.6
    Affected: >= 1.50.0-next.0, < 1.54.6
    		Create a notification for this product.
    @backstage backend-defaults Affected: < 0.16.1
    Affected: >= 0.17.0, < 0.17.8
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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            "availabilityImpact": "LOW",
            "baseScore": 7.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L",
            "version": "3.1"
          }
        }
      ],
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        {
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              "cweId": "CWE-269",
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              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
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              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
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          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-06T20:48:05.896Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v",
          "tags": [
            "x_refsource_CONFIRM"
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          "url": "https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v"
        },
        {
          "name": "https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124",
          "tags": [
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        },
        {
          "name": "https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33",
          "tags": [
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          "url": "https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33"
        },
        {
          "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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          "tags": [
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      ],
      "source": {
        "advisory": "GHSA-cq7v-rfgc-5c7v",
        "discovery": "UNKNOWN"
      },
      "title": "Backstage: Improper preservation of access restrictions during service credential delegation"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-106492",
    "datePublished": "2026-10-06T20:48:05.896Z",
    "dateReserved": "2026-10-06T18:46:47.766Z",
    "dateUpdated": "2026-10-09T01:51:07.252Z",
    "state": "PUBLISHED"
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}