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Low

Template Secret leakage in logs in Scaffolder when using `fetch:template`

  • Disclosed: 15.08.2025
  • Updated: 11.10.2026 10:22

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.

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Affected software

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PlatformPackageVulnerable versionsFixed in
npm package @backstage/plugin-scaffolder-backend < 2.1.1 2.1.1

References

CVSS score 2.6/10
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:N/A:N
Weakness (CWE)
CWE-532
Platform
npm
Package
@backstage/plugin-scaffolder-backend
Disclosed
15.08.2025
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-3x3q-ghcp-whf7 - CC BY 4.0

Vulnerability history: @backstage/plugin-scaffolder-backend

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (17) in the archive
Total entries
17
First → latest
10.2021 10.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 1
  • High 6
  • Medium 8
  • Low 2

Disclosures per year

Severity:
  1. Backstage: Sensitive information exposure in Scaffolder
    Critical · 9.6 CVE-2026-106501 < 3.3.1, >= 3.4.0, < 3.4.1, >= 4.0.0, < 4.0.3, >= 4.0.4, < 4.1.0 3.3.1, 3.4.1, 4.0.3, 4.1.0
  2. Backstage: Scaffolder action input authorization bypass
    High · 8.1 CVE-2026-106503 < 3.3.1, >= 3.4.0, < 3.4.1, >= 4.0.0, < 4.0.3, >= 4.0.4, < 4.1.0 3.3.1, 3.4.1, 4.0.3, 4.1.0
  3. Backstage: Improper task state validation in Scaffolder backend
    High · 8.5 CVE-2026-106500 < 4.1.0 4.1.0
  4. Backstage has a Possible Symlink Path Traversal in Scaffolder Actions
    High · 7.1 CVE-2026-24046 < 2.2.2, >= 3.0.0, < 3.0.2, >= 3.1.0, < 3.1.1 2.2.2, 3.0.2, 3.1.1
  5. Template Secret leakage in logs in Scaffolder when using `fetch:template` this entry
    Low · 2.6 CVE-2025-55285 < 2.1.1 2.1.1
  6. Backstage Scaffolder plugin has insecure sandbox
    High · 8.0 CVE-2023-35926 < 1.15.0 1.15.0
  7. RCE vulnerability affecting v1beta3 templates in @backstage/plugin-scaffolder-backend
    High ghsa-2g8g-63j4-9w3r < 0.15.14 0.15.14
  8. Path Traversal in @backstage/plugin-scaffolder-backend
    High · 8.5 CVE-2021-43783 < 0.15.14 0.15.14

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