CVE-2025-55285: @backstage/plugin scaffolder backend Template` Vulnerability

LOW
Advisory Identifier: GHSA-3x3q-ghcp-whf7
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CVSS 2.6
CWE-532
Published
Advisory Summary

CVE-2025-55285 is a LOW (CVSS 2.6) template` vulnerability (CWE-532: Insertion of Sensitive Information into Log File) affecting @backstage/plugin scaffolder backend libraries in the npm ecosystem. The issue involves template`. Remediation is available by upgrading affected packages to version 2.1.1.

CVE-2025-55285 at a Glance

CVE Identifier CVE-2025-55285
GHSA Identifier GHSA-3x3q-ghcp-whf7
Severity LOW
CVSS v3.1 Base Score 2.6
CWE Classification CWE-532: Insertion of Sensitive Information into Log File
Affected Product @backstage/plugin scaffolder backend
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 2.6

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required High (PR:H)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2025-55285

To remediate this vulnerability, upgrade all affected @backstage/plugin scaffolder backend dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

@backstage/plugin-scaffolder-backend fixed: 2.1.1 
npm install @backstage/plugin-scaffolder-backend@2.1.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls @backstage/plugin-scaffolder-backend

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2025-55285, inspect your project dependencies using npm:

npm ls @backstage/plugin-scaffolder-backend

Analyze the terminal output to locate any version of @backstage/plugin scaffolder backend in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.1.1), your application is affected.

Note: The npm ls @backstage/plugin-scaffolder-backend command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-532: Insertion of Sensitive Information into Log File, where the product writes sensitive information to a log file. In @backstage/plugin scaffolder backend, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A logging flaw in Backstage Scaffolder’s `fetch:template` action up to `@backstage/plugin-scaffolder-backend` **2.1.0** may write template secrets to logs. The action emitted a duplicate, pre-redaction copy of input parameters, so values provided via the `{{ secrets }}` bag could appear in local/server logs when the action ran. Exploitation requires use of the `secrets` argument and access to Scaffolder/build logs; integrity and availability are unaffected. * **Fix:** upgrade to `2.1.1`, which removes the duplicate log path and ensures secrets are redacted. * **Mitigation:** avoid passing `{{ secrets }}` to `fetch:template` if upgrade is not possible. > Open an issue in the [Backstage repository](https://github.com/backstage/backstage) > > Visit our Discord, linked to in [Backstage README](https://github.com/backstage/backstage)

CVE-2025-55285 Affected @backstage/plugin scaffolder backend Versions

1 component(s)
Fixed Versions:
2.1.1
Product / Package Ecosystem Affected Versions Fixed Version
@backstage/plugin-scaffolder-backend
npm/@backstage/plugin-scaffolder-backend
npm
< 2.1.1
2.1.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/backstage/backstage/security/advisories/GHSA-3x3q-ghcp-whf7
NVD — CVE-2025-55285 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-55285
Security Fix Commit FIX COMMIT
https://github.com/backstage/backstage/commit/c371f6fe12371de31dca537510e6653e287cdc2e
@backstage/plugin scaffolder backend Source Repository REPOSITORY
https://github.com/backstage/backstage

Frequently Asked Questions

What is CVE-2025-55285?
CVE-2025-55285 is a security vulnerability in @backstage/plugin scaffolder backend involving template` under CWE-532: Insertion of Sensitive Information into Log File.
Which @backstage/plugin scaffolder backend versions are affected?
Affected versions include releases prior to 2.1.1 across affected packages: @backstage/plugin-scaffolder-backend.
What version fixes CVE-2025-55285?
Upgrading to 2.1.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @backstage/plugin-scaffolder-backend affected?
Yes, @backstage/plugin-scaffolder-backend is affected in releases prior to 2.1.1. Upgrade your dependency to 2.1.1 or later.
What is the CVSS score of CVE-2025-55285?
CVE-2025-55285 has a CVSS v3.1 base score of 2.6 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:N/A:N.
What CWE is associated with CVE-2025-55285?
CVE-2025-55285 is classified under CWE-532: Insertion of Sensitive Information into Log File (The product writes sensitive information to a log file.).
How can I check npm dependencies for CVE-2025-55285?
Run the dependency tree command: 'npm ls @backstage/plugin-scaffolder-backend'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3x3q-ghcp-whf7",
  "modified" : "2025-09-26T17:19:17Z",
  "published" : "2025-08-15T18:43:16Z",
  "aliases" : [ "CVE-2025-55285" ],
  "summary" : "Template Secret leakage in logs in Scaffolder when using `fetch:template`",
  "details" : "A logging flaw in Backstage Scaffolder’s `fetch:template` action up to `@backstage/plugin-scaffolder-backend` **2.1.0** may write template secrets to logs. The action emitted a duplicate, pre-redaction copy of input parameters, so values provided via the `{{ secrets }}` bag could appear in local/server logs when the action ran. Exploitation requires use of the `secrets` argument and access to Scaffolder/build logs; integrity and availability are unaffected.\n\n*   **Fix:** upgrade to `2.1.1`, which removes the duplicate log path and ensures secrets are redacted.\n*   **Mitigation:** avoid passing `{{ secrets }}` to `fetch:template` if upgrade is not possible.\n\n> Open an issue in the [Backstage repository](https://github.com/backstage/backstage)\n>\n> Visit our Discord, linked to in [Backstage README](https://github.com/backstage/backstage)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@backstage/plugin-scaffolder-backend"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.1.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.1.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/backstage/backstage/security/advisories/GHSA-3x3q-ghcp-whf7"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-55285"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/backstage/backstage/commit/c371f6fe12371de31dca537510e6653e287cdc2e"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/backstage/backstage"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-532" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-08-15T18:43:16Z",
    "nvd_published_at" : "2025-08-15T18:15:27Z"
  }
}