Vulnerability-Lookup

GHSA-RQ6Q-WR2Q-7PGP

Vulnerability from github – Published: 2026-01-21 22:36 – Updated: 2026-01-22 15:41

Summary

Backstage has a Possible Symlink Path Traversal in Scaffolder Actions

Details

Impact

Multiple Scaffolder actions and archive extraction utilities were vulnerable to symlink-based path traversal attacks. An attacker with access to create and execute Scaffolder templates could exploit symlinks to:

Read arbitrary files via the debug:log action by creating a symlink pointing to sensitive files (e.g., /etc/passwd, configuration files, secrets)
Delete arbitrary files via the fs:delete action by creating symlinks pointing outside the workspace
Write files outside the workspace via archive extraction (tar/zip) containing malicious symlinks

This affects any Backstage deployment where users can create or execute Scaffolder templates.

Patches

This vulnerability is fixed in the following package versions:

@backstage/backend-defaults version 0.12.2, 0.13.2, 0.14.1, 0.15.0
@backstage/plugin-scaffolder-backend version 2.2.2, 3.0.2, 3.1.1
@backstage/plugin-scaffolder-node version 0.11.2, 0.12.3

Users should upgrade to these versions or later.

Workarounds

Follow the recommendation in the Backstage Threat Model to limit access to creating and updating templates
Restrict who can create and execute Scaffolder templates using the permissions framework
Audit existing templates for symlink usage
Run Backstage in a containerized environment with limited filesystem access

References

Severity ?

7.1 (High)


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

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/backend-defaults"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.12.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/backend-defaults"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.13.0"
            },
            {
              "fixed": "0.13.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/backend-defaults"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.14.0"
            },
            {
              "fixed": "0.14.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/plugin-scaffolder-backend"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/plugin-scaffolder-backend"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/plugin-scaffolder-backend"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.1.0"
            },
            {
              "fixed": "3.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/plugin-scaffolder-node"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.11.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/plugin-scaffolder-node"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.12.0"
            },
            {
              "fixed": "0.12.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-24046"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-59"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-21T22:36:36Z",
    "nvd_published_at": "2026-01-21T23:15:53Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nMultiple Scaffolder actions and archive extraction utilities were vulnerable to symlink-based path traversal attacks. An attacker with access to create and execute Scaffolder templates could exploit symlinks to:\n\n1. **Read arbitrary files** via the `debug:log` action by creating a symlink pointing to sensitive files (e.g., `/etc/passwd`, configuration files, secrets)\n2. **Delete arbitrary files** via the `fs:delete` action by creating symlinks pointing outside the workspace\n3. **Write files outside the workspace** via archive extraction (tar/zip) containing malicious symlinks\n\nThis affects any Backstage deployment where users can create or execute Scaffolder templates.\n\n### Patches\n\nThis vulnerability is fixed in the following package versions:\n\n- `@backstage/backend-defaults` version 0.12.2, 0.13.2, 0.14.1, 0.15.0\n- `@backstage/plugin-scaffolder-backend` version 2.2.2, 3.0.2, 3.1.1\n- `@backstage/plugin-scaffolder-node` version 0.11.2, 0.12.3\n\nUsers should upgrade to these versions or later.\n\n### Workarounds\n\n- Follow the recommendation in the [Backstage Threat Model](https://backstage.io/docs/overview/threat-model#scaffolder) to limit access to creating and updating templates\n- Restrict who can create and execute Scaffolder templates using the permissions framework\n- Audit existing templates for symlink usage\n- Run Backstage in a containerized environment with limited filesystem access\n\n### References\n\n- [CWE-59: Improper Link Resolution Before File Access](https://cwe.mitre.org/data/definitions/59.html)\n- [OWASP Path Traversal](https://owasp.org/www-community/attacks/Path_Traversal)",
  "id": "GHSA-rq6q-wr2q-7pgp",
  "modified": "2026-01-22T15:41:18Z",
  "published": "2026-01-21T22:36:36Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/security/advisories/GHSA-rq6q-wr2q-7pgp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-24046"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/commit/c641c147ab371a9a8a2f5f67fdb7cb9c97ef345d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/backstage/backstage"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Backstage has a Possible Symlink Path Traversal in Scaffolder Actions"
}

CVE-2026-24046 (GCVE-0-2026-24046)

Vulnerability from cvelistv5 – Published: 2026-01-21 22:36 – Updated: 2026-01-22 16:49

Title

Backstage has a Possible Symlink Path Traversal in Scaffolder Actions

Summary

Backstage is an open framework for building developer portals. Multiple Scaffolder actions and archive extraction utilities were vulnerable to symlink-based path traversal attacks. An attacker with access to create and execute Scaffolder templates could exploit symlinks to read arbitrary files via the `debug:log` action by creating a symlink pointing to sensitive files (e.g., `/etc/passwd`, configuration files, secrets); delete arbitrary files via the `fs:delete` action by creating symlinks pointing outside the workspace, and write files outside the workspace via archive extraction (tar/zip) containing malicious symlinks. This affects any Backstage deployment where users can create or execute Scaffolder templates. This vulnerability is fixed in `@backstage/backend-defaults` versions 0.12.2, 0.13.2, 0.14.1, and 0.15.0; `@backstage/plugin-scaffolder-backend` versions 2.2.2, 3.0.2, and 3.1.1; and `@backstage/plugin-scaffolder-node` versions 0.11.2 and 0.12.3. Users should upgrade to these versions or later. Some workarounds are available. Follow the recommendation in the Backstage Threat Model to limit access to creating and updating templates, restrict who can create and execute Scaffolder templates using the permissions framework, audit existing templates for symlink usage, and/or run Backstage in a containerized environment with limited filesystem access.

Severity ?

7.1 (High)


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

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/backstage/backstage/security/a…	x_refsource_CONFIRM
	https://github.com/backstage/backstage/commit/c64…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	backstage	backstage	Affected: @backstage/backend-defaults < 0.12.2 Affected: @backstage/backend-defaults >= 0.13.0, < 0.13.2 Affected: @backstage/backend-defaults >= 0.14.0, < 0.14.1 Affected: @backstage/plugin-scaffolder-backend < 2.2.2 Affected: @backstage/plugin-scaffolder-backend >= 3.0.0, < 3.0.2 Affected: @backstage/plugin-scaffolder-backend >= 3.1.0, < 3.1.1 Affected: @backstage/plugin-scaffolder-node < 0.11.2 Affected: @backstage/plugin-scaffolder-node >= 0.12.0, < 0.12.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-24046",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-22T15:09:21.771684Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-22T16:49:11.684Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "backstage",
          "vendor": "backstage",
          "versions": [
            {
              "status": "affected",
              "version": "@backstage/backend-defaults \u003c 0.12.2"
            },
            {
              "status": "affected",
              "version": "@backstage/backend-defaults \u003e= 0.13.0, \u003c 0.13.2"
            },
            {
              "status": "affected",
              "version": "@backstage/backend-defaults \u003e= 0.14.0, \u003c 0.14.1"
            },
            {
              "status": "affected",
              "version": "@backstage/plugin-scaffolder-backend \u003c 2.2.2"
            },
            {
              "status": "affected",
              "version": "@backstage/plugin-scaffolder-backend \u003e= 3.0.0, \u003c 3.0.2"
            },
            {
              "status": "affected",
              "version": "@backstage/plugin-scaffolder-backend \u003e= 3.1.0, \u003c 3.1.1"
            },
            {
              "status": "affected",
              "version": "@backstage/plugin-scaffolder-node \u003c 0.11.2"
            },
            {
              "status": "affected",
              "version": "@backstage/plugin-scaffolder-node \u003e= 0.12.0, \u003c 0.12.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Backstage is an open framework for building developer portals. Multiple Scaffolder actions and archive extraction utilities were vulnerable to symlink-based path traversal attacks. An attacker with access to create and execute Scaffolder templates could exploit symlinks to read arbitrary files via the `debug:log` action by creating a symlink pointing to sensitive files (e.g., `/etc/passwd`, configuration files, secrets); delete arbitrary files via the `fs:delete` action by creating symlinks pointing outside the workspace, and write files outside the workspace via archive extraction (tar/zip) containing malicious symlinks. This affects any Backstage deployment where users can create or execute Scaffolder templates. This vulnerability is fixed in `@backstage/backend-defaults` versions 0.12.2, 0.13.2, 0.14.1, and 0.15.0; `@backstage/plugin-scaffolder-backend` versions 2.2.2, 3.0.2, and 3.1.1; and `@backstage/plugin-scaffolder-node` versions 0.11.2 and 0.12.3. Users should upgrade to these versions or later. Some workarounds are available. Follow the recommendation in the Backstage Threat Model to limit access to creating and updating templates, restrict who can create and execute Scaffolder templates using the permissions framework, audit existing templates for symlink usage, and/or run Backstage in a containerized environment with limited filesystem access."
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L",
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        {
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              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
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        {
          "descriptions": [
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              "cweId": "CWE-59",
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              "type": "CWE"
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          "tags": [
            "x_refsource_MISC"
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        "advisory": "GHSA-rq6q-wr2q-7pgp",
        "discovery": "UNKNOWN"
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      "title": "Backstage has a Possible Symlink Path Traversal in Scaffolder Actions"
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    "datePublished": "2026-01-21T22:36:30.794Z",
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}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-RQ6Q-WR2Q-7PGP

Impact

Patches

Workarounds

References

CVE-2026-24046 (GCVE-0-2026-24046)

Tags

Sightings

Nomenclature