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CVE-2026-106501 — Vulnerability in...

CRITICAL

Backstage: Sensitive information exposure in Scaffolder

Published October 7, 2026Updated October 7, 2026Source: osv

Summary

### Impact An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. ### Patches Patched in `@backstage/plugin-scaffolder-backend` version `4.1.0` ### Workarounds - Configure `scaffolder.task.read` with the `isTaskOwner` condition so users can only read tasks they created. - Restrict affected integrations and workflows to trusted operators until an upgrade is available.

Advisory Timeline

  • First published October 7, 2026 (5 days ago).
  • Last revised October 7, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm
Update @backstage/plugin-scaffolder-backend to 3.3.1 or later
npm install @backstage/plugin-scaffolder-backend@3.3.1
npm
Update @backstage/plugin-scaffolder-backend to 3.4.1 or later
npm install @backstage/plugin-scaffolder-backend@3.4.1
npm
Update @backstage/plugin-scaffolder-backend to 4.1.0 or later
npm install @backstage/plugin-scaffolder-backend@4.1.0
npm
Update @backstage/plugin-scaffolder-backend to 4.0.3 or later
npm install @backstage/plugin-scaffolder-backend@4.0.3

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (4)

Affects 1 ecosystem: npm (1).

PackageEcosystemAffectedFixed In
@backstage/plugin-scaffolder-backend
npm
All versions3.3.1
@backstage/plugin-scaffolder-backend
npm
All versions3.4.1
@backstage/plugin-scaffolder-backend
npm
All versions4.1.0
@backstage/plugin-scaffolder-backend
npm
All versions4.0.3

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.6 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

References

Frequently Asked Questions

What is CVE-2026-106501?
Backstage: Sensitive information exposure in Scaffolder This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.6/10).
How do I check if my project is affected by CVE-2026-106501?
CVE-2026-106501 affects @backstage/plugin-scaffolder-backend. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-106501 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.6

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-g2v8-7jhw-pp8p

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