CVE-2026-106501

Undergoing Analysis Undergoing Analysis - In Progress

BaseFortify

Publication date: 2026-10-06

Last updated on: 2026-10-13

Assigner: GitHub, Inc.

Description

Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder. 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. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-06

Last Modified

2026-10-13

Generated

2026-10-19

AI Q&A

2026-10-07

EPSS Evaluated

2026-10-18

NVD

CVE-2026-106501

EUVD

EUVD-2026-94059

Affected Vendors & Products

Vendor	Product	Version / Range
linuxfoundation	backstage/plugin-scaffolder-backend	to 3.3.1 (exc)
linuxfoundation	backstage/plugin-scaffolder-backend	From 3.4.0 (inc) to 3.4.1 (exc)
linuxfoundation	backstage/plugin-scaffolder-backend	From 4.0.0 (inc) to 4.0.3 (exc)
linuxfoundation	backstage/plugin-scaffolder-backend	From 4.0.4 (inc) to 4.1.0 (exc)
linuxfoundation	backstage	to 1.49.6 (exc)
linuxfoundation	backstage	From 1.50.0 (inc) to 1.50.5 (exc)
linuxfoundation	backstage	From 1.51.0 (inc) to 1.54.6 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-201	The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor.
CWE-200	The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Attack-Flow Graph

Executive Summary

This vulnerability in Backstage's @backstage/plugin-scaffolder-backend allows an authenticated user to access internal execution data from another user's Scaffolder task. This could include sensitive information like credentials for external services.

Detection Guidance

To detect this vulnerability, check if your Backstage deployment is running a vulnerable version of @backstage/plugin-scaffolder-backend (versions before 3.3.1, 3.4.1, 4.0.3, or 4.1.0). Inspect Scaffolder task logs for exposed credentials or internal execution data. Review user permissions to ensure only authorized users can access task data.

Impact Analysis

If exploited, this vulnerability could lead to unauthorized access to external services using exposed credentials. This may result in data breaches, service disruptions, or unauthorized changes in those external systems.

Compliance Impact

This vulnerability could lead to unauthorized data exposure or modifications, potentially violating GDPR (data protection) and HIPAA (health data privacy) requirements. Compliance risks include data breaches, unauthorized access, and failure to protect sensitive information.

Mitigation Strategies

Upgrade the @backstage/plugin-scaffolder-backend package to version 3.3.1, 3.4.1, 4.0.3 or 4.1.0 or later to address the sensitive information exposure vulnerability.

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