Vulnerability-Lookup

GHSA-CQ7V-RFGC-5C7V

Vulnerability from github – Published: 2026-10-07 17:59 – Updated: 2026-10-07 17:59

Summary

Backstage: Improper preservation of access restrictions during service credential delegation

Details

Impact

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.

Patches

Patched in @backstage/backend-defaults version 0.17.8

Workarounds

If you're unable to upgrade immediately:

If practical, replace restricted credentials with separate, purpose-specific unrestricted credentials scoped to trusted consumers.
Restrict network-level access to Backstage backend API endpoints to trusted callers only.

Severity

7.6 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/backend-defaults"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.17.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-106492"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-269",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-07T17:59:43Z",
    "nvd_published_at": "2026-10-06T21:17:18Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nAn 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.\n\n### Patches\n\nPatched in `@backstage/backend-defaults` version `0.17.8`\n\n### Workarounds\n\nIf you\u0027re unable to upgrade immediately:\n\n- If practical, replace restricted credentials with separate, purpose-specific unrestricted credentials scoped to trusted consumers.\n- Restrict network-level access to Backstage backend API endpoints to trusted callers only.",
  "id": "GHSA-cq7v-rfgc-5c7v",
  "modified": "2026-10-07T17:59:44Z",
  "published": "2026-10-07T17:59:43Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-106492"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/backstage/backstage"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.49.6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Backstage: Improper preservation of access restrictions during service credential delegation"
}

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

Vulnerability from cvelistv5 – Published: 2026-10-06 20:48 – Updated: 2026-10-09 01:51

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 7608 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/backstage/backstage/security/a…	x_refsource_CONFIRM
https://github.com/backstage/backstage/commit/403…	x_refsource_MISC
https://github.com/backstage/backstage/commit/bc8…	x_refsource_MISC
https://github.com/backstage/backstage/releases/t…	x_refsource_MISC
https://github.com/backstage/backstage/releases/t…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version
backstage	backstage	Affected: < 1.49.6 Affected: >= 1.50.0-next.0, < 1.54.6
@backstage	backend-defaults	Affected: < 0.16.1 Affected: >= 0.17.0, < 0.17.8

Show details on NVD website

JSON

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
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              "content": {
                "id": "CVE-2026-106492",
                "options": [
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-09T01:50:58.091263Z",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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            },
            {
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            }
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      ],
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          "lang": "en",
          "value": "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."
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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          "url": "https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124"
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        {
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        },
        {
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        },
        {
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    "datePublished": "2026-10-06T20:48:05.896Z",
    "dateReserved": "2026-10-06T18:46:47.766Z",
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    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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