What’s Vulnerable › Vulnerabilities

CVE-2026-106504: Backstage: Sensitive information exposure in scaffolder task logs

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-13
• Weakness: CWE-532

Description

Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder task logs. An authenticated user who can create and read scaffolder tasks may be able to observe sensitive values in task logs in deployments with restrictive action permissions and affected templates. Exploitation requires a denied action whose input contains such a value. This issue is fixed in version 4.1.0.

Affected products

• backstage: before 1.54.6 — fixed in 1.54.6
• @backstage plugin-scaffolder-backend: before 4.1.0 — fixed in 4.1.0

How to fix

Upgrade to a fixed version: backstage 1.54.6; @backstage plugin-scaffolder-backend 4.1.0. Check the vendor advisory for mitigations.

References

• https://github.com/backstage/backstage/commit/3eb3dc59eb0da0deccd532f19eb460bb452c9efb
• https://github.com/backstage/backstage/releases/tag/v1.54.6
• https://github.com/backstage/backstage/security/advisories/GHSA-4xvq-3m68-h444

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