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.
2.1.1, which removes the duplicate log path and ensures secrets are redacted.{{ secrets }} to fetch:template if upgrade is not possible.Open an issue in the Backstage repository
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{
"nvd_published_at": "2025-08-15T18:15:27Z",
"severity": "LOW",
"cwe_ids": [
"CWE-532"
],
"github_reviewed": true,
"github_reviewed_at": "2025-08-15T18:43:16Z"
}