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

Vulnerability from cvelistv5 – Published: 2026-10-06 20:48 – Updated: 2026-10-06 20:48
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
CWE
  • CWE-269 - Improper Privilege Management
  • CWE-863 - Incorrect Authorization
Assigner
References
Impacted products
Vendor Product Version CPE status
backstage backstage Affected: < 1.49.6
Affected: >= 1.50.0-next.0, < 1.54.6
guessed Create a notification for this product.
@backstage backend-defaults Affected: < 0.16.1
Affected: >= 0.17.0, < 0.17.8
guessed Create a notification for this product.
Show details on NVD website
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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 1.54.6"
            }
          ]
        },
        {
          "product": "backend-defaults",
          "vendor": "@backstage",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.16.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 0.17.0, \u003c 0.17.8"
            }
          ]
        }
      ],
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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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
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              "description": "CWE-269: Improper Privilege Management",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "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"
          ],
          "url": "https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v"
        },
        {
          "name": "https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124"
        },
        {
          "name": "https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33"
        },
        {
          "name": "https://github.com/backstage/backstage/releases/tag/v1.49.6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/backstage/backstage/releases/tag/v1.49.6"
        },
        {
          "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-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": "2026-10-06T20:48:05.896Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-106492",
      "date": "2026-10-07",
      "epss": "0.00238",
      "percentile": "0.1367"
    },
    "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 1.54.6"
                  }
                ]
              },
              {
                "product": "backend-defaults",
                "vendor": "@backstage",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 0.16.1"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 0.17.0, \u003c 0.17.8"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "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."
          }
        ],
        "id": "CVE-2026-106492",
        "lastModified": "2026-10-07T13:58:29.527",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "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"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 4.7,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-06T21:17:18.220",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/backstage/backstage/releases/tag/v1.49.6"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Awaiting Analysis",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-269"
              },
              {
                "lang": "en",
                "value": "CWE-863"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-10-07T12:01:54+00:00",
      "cve": "CVE-2026-106492",
      "id": "CVE-2026-106492",
      "initial_release_date": "2026-10-06T20:48:05.896000+00:00",
      "product_status:known_affected": "5",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "@backstage/backend-defaults: @backstage/backend-defaults: Access control bypass via improper service credential delegation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106492.json",
      "version": "3"
    }
  }
}



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