Backstage: Improper input validation in scaffolder task list ordering

Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by improper input validation in scaffolder task list ordering. An authenticated Backstage user with permission to create and read relevant scaffolder tasks may be able to infer confidential task data under specific conditions. Successful exploitation requires retained task secrets, visibility of a target task, knowledge of the secret structure, and repeated requests. This issue is fixed in version 4.1.0.

Problem type

Affected products

backstage

backstage

< 1.54.6 - AFFECTED

@backstage

plugin-scaffolder-backend

< 4.1.0 - AFFECTED

References

https://github.com/backstage/backstage/security/advisories/GHSA-vwp5-f99x-x3rq

https://github.com/backstage/backstage/security/advisories/GHSA-vwp5-f99x-x3rq

x_refsource_CONFIRM

https://github.com/backstage/backstage/commit/e673a869449874a9169e8f89852e75e862011b93

https://github.com/backstage/backstage/commit/e673a869449874a9169e8f89852e75e862011b93

x_refsource_MISC

https://github.com/backstage/backstage/releases/tag/v1.54.6

https://github.com/backstage/backstage/releases/tag/v1.54.6

x_refsource_MISC

JSON source

https://cveawg.mitre.org/api/cve/CVE-2026-106506

Click to expand

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-106506",
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "dateUpdated": "2026-10-06T21:44:31.904Z",
    "dateReserved": "2026-10-06T18:46:47.766Z",
    "datePublished": "2026-10-06T21:44:31.904Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M",
        "dateUpdated": "2026-10-06T21:44:31.904Z"
      },
      "title": "Backstage: Improper input validation in scaffolder task list ordering",
      "descriptions": [
        {
          "lang": "en",
          "value": "Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by improper input validation in scaffolder task list ordering. An authenticated Backstage user with permission to create and read relevant scaffolder tasks may be able to infer confidential task data under specific conditions. Successful exploitation requires retained task secrets, visibility of a target task, knowledge of the secret structure, and repeated requests. This issue is fixed in version 4.1.0."
        }
      ],
      "affected": [
        {
          "vendor": "backstage",
          "product": "backstage",
          "versions": [
            {
              "version": "< 1.54.6",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "@backstage",
          "product": "plugin-scaffolder-backend",
          "versions": [
            {
              "version": "< 4.1.0",
              "status": "affected"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-202: Exposure of Sensitive Information Through Data Queries",
              "cweId": "CWE-202",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-203: Observable Discrepancy",
              "cweId": "CWE-203",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/backstage/backstage/security/advisories/GHSA-vwp5-f99x-x3rq",
          "name": "https://github.com/backstage/backstage/security/advisories/GHSA-vwp5-f99x-x3rq",
          "tags": [
            "x_refsource_CONFIRM"
          ]
        },
        {
          "url": "https://github.com/backstage/backstage/commit/e673a869449874a9169e8f89852e75e862011b93",
          "name": "https://github.com/backstage/backstage/commit/e673a869449874a9169e8f89852e75e862011b93",
          "tags": [
            "x_refsource_MISC"
          ]
        },
        {
          "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6",
          "name": "https://github.com/backstage/backstage/releases/tag/v1.54.6",
          "tags": [
            "x_refsource_MISC"
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
            "attackVector": "NETWORK",
            "attackComplexity": "HIGH",
            "privilegesRequired": "LOW",
            "userInteraction": "NONE",
            "scope": "UNCHANGED",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM"
          }
        }
      ]
    }
  }
}