CVE-2026-29184: @backstage/plugin-scaffolder-backend Vulnerable to Potential Session Token Exfiltration via Log Redaction Bypass

March 5, 2026 (updated March 9, 2026)

A malicious scaffolder template can bypass the log redaction mechanism to exfiltrate secrets provided run through task event logs.

The attack requires:

The ability to register a template in the catalog
A victim who executes the malicious template

References

backstage.io/docs/overview/threat-model
backstage.io/docs/permissions/plugin-authors/01-setup
github.com/advisories/GHSA-8qp7-fhr9-fw53
github.com/backstage/backstage
github.com/backstage/backstage/security/advisories/GHSA-8qp7-fhr9-fw53
nvd.nist.gov/vuln/detail/CVE-2026-29184

Code Behaviors & Features

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