CVE-2026-106506

Analyzed Analyzed - Analysis Complete

Improper Input Validation in Backstage Scaffolder Backend

Publication date: 2026-10-06

Last updated on: 2026-10-09

Assigner: GitHub, Inc.

Description

Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by improper input validation in scaffolder task list ordering. An authenticated Backstage user with permission to create and read relevant scaffolder tasks may be able to infer confidential task data under specific conditions. Successful exploitation requires retained task secrets, visibility of a target task, knowledge of the secret structure, and repeated requests. This issue is fixed in version 4.1.0.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-10-06

Last Modified

2026-10-09

Generated

2026-10-19

AI Q&A

2026-10-07

EPSS Evaluated

2026-10-18

NVD

CVE-2026-106506

EUVD

EUVD-2026-94071

Affected Vendors & Products

Vendor	Product	Version / Range
linuxfoundation	backstage/plugin-scaffolder-backend	to 4.1.0 (exc)
linuxfoundation	backstage	to 1.54.6 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-202	When trying to keep information confidential, an attacker can often infer some of the information by using statistics.
CWE-203	The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.

Attack-Flow Graph

Executive Summary

This vulnerability affects the @backstage/plugin-scaffolder-backend package in Backstage versions prior to 4.1.0. It involves improper input validation in the ordering of scaffolder task lists. An authenticated user with specific permissions could infer confidential task data under certain conditions.

Detection Guidance

Detection requires monitoring for unauthorized access to scaffolder task data. Check Backstage logs for repeated requests to task endpoints, especially those accessing task secrets. Look for unusual patterns in task visibility or secret exposure. No specific commands are provided in the context.

Impact Analysis

If exploited, this vulnerability could allow an attacker to access confidential task data. Successful exploitation requires specific conditions like retained task secrets, task visibility, knowledge of secret structure, and repeated requests. The impact is limited to data exposure rather than system compromise.

Compliance Impact

This vulnerability may lead to unauthorized access to confidential task data, which could violate data protection requirements under GDPR and HIPAA if such data includes personal or health information. The improper input validation allows inference of secrets, potentially exposing sensitive information.

Mitigation Strategies

Upgrade the @backstage/plugin-scaffolder-backend package to version 4.1.0 or later to address the improper input validation issue.

Hi! I’m here to help you understand CVE-2026-106506. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70