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Insecure sandbox in Backstage Scaffolder plugin

Type: advisorySources: OSV

Backstage is an open platform for building developer portals. The Backstage scaffolder-backend plugin uses a templating library that requires sandbox, as it by design allows for code injection. The library used for this sandbox so far has been `vm2`, but in light of several past vulnerabilities and existing vulnerabilities that may not have a fix, the plugin has switched to using a different sandbox library. A malicious actor with write access to a registered scaffolder template could manipulate the template in a way that allows for remote code execution on the scaffolder-backend instance. This was only exploitable in the template YAML definition itself and not by user input data. This is vulnerability is fixed in version 1.15.0 of `@backstage/plugin-scaffolder-backend`.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2023-35926
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 20:13 UTC · Revision 1

Source evidence

Insecure sandbox in Backstage Scaffolder plugin

core-osv · Original source

Published 22 Jun 2023, 13:29 UTC

Backstage is an open platform for building developer portals. The Backstage scaffolder-backend plugin uses a templating library that requires sandbox, as it by design allows for code injection. The library used for this sandbox so far has been `vm2`, but in light of several past vulnerabilities and existing vulnerabilities that may not have a fix, the plugin has switched to using a different sandbox library. A malicious actor with write access to a registered scaffolder template could manipulate the template in a way that allows for remote code execution on the scaffolder-backend instance. This was only exploitable in the template YAML definition itself and not by user input data. This is vulnerability is fixed in version 1.15.0 of `@backstage/plugin-scaffolder-backend`.

osv:CVE-2023-35926
Complete source record
{
  "id": "f0fd292325863fe5def57447ce44c3c2f5957153de8b651179bc8128dac94258",
  "url": "https://osv.dev/vulnerability/CVE-2023-35926",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Insecure sandbox in Backstage Scaffolder plugin",
    "summary": "Backstage is an open platform for building developer portals. The Backstage scaffolder-backend plugin uses a templating library that requires sandbox, as it by design allows for code injection. The library used for this sandbox so far has been `vm2`, but in light of several past vulnerabilities and existing vulnerabilities that may not have a fix, the plugin has switched to using a different sandbox library. A malicious actor with write access to a registered scaffolder template could manipulate the template in a way that allows for remote code execution on the scaffolder-backend instance. This was only exploitable in the template YAML definition itself and not by user input data. This is vulnerability is fixed in version 1.15.0 of `@backstage/plugin-scaffolder-backend`.",
    "evidence": "osv:CVE-2023-35926",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2023-35926",
      "aliases": [
        "CVE-2023-35926",
        "GHSA-wg6p-jmpc-xjmr"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "type": "GIT",
              "events": [
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                  "introduced": "0"
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                {
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              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
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                    ],
                    "source": "CPE_RANGE"
                  },
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                    "range": [
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                    "source": "REFERENCES_COMMIT"
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                    "source": "REFERENCES_TAG",
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-35926.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.986545031Z",
      "provider": "osv",
      "references": [
        "https://github.com/backstage/backstage/releases/tag/v1.15.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/35xxx/CVE-2023-35926.json",
        "https://github.com/backstage/backstage/security/advisories/GHSA-wg6p-jmpc-xjmr",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-35926",
        "https://github.com/backstage/backstage/commit/fb7375507d56faedcb7bb3665480070593c8949a"
      ],
      "provider_metadata": {
        "cwe_ids": [
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        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/35xxx/CVE-2023-35926.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-35926",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498920,
  "published_at": "2023-06-22T13:29:03.361+00:00"
}