What’s Vulnerable › Vulnerabilities

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

• Severity: low (CVSS 2.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-15 · updated 2026-06-17
• Weakness: CWE-532

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.

Affected products

• backstage: before 2.1.1

References

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

Get alerted when CVE-2025-55285 or the next vulnerability affects your stack