CVE-2026-106499
Published:October 06, 2026
Updated:October 10, 2026
Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package could expose secret-derived values in Scaffolder task logs. Deployments that configure sensitive scaffolder.defaultEnvironment.secrets and allow an attacker to create or modify Scaffolder templates are affected. A template author could cause secret-derived values used during template iteration to be persisted and exposed to users who can access the resulting task logs. This issue is fixed in version 4.1.0.
Affected Packages
https://github.com/backstage/backstage.git (GITHUB):
Affected version(s) >=v1.46.0 <v1.54.6Fix Suggestion:
Update to version v1.54.6@backstage/plugin-scaffolder-backend (NPM):
Affected version(s) >=4.0.0 <4.1.0Fix Suggestion:
Update to version 4.1.0@backstage/plugin-scaffolder-backend (NPM):
Affected version(s) >=0.0.0-nightly-2020972106 <4.1.0Fix Suggestion:
Update to version 4.1.0Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.9
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Insertion of Sensitive Information into Log File
EPSS
Base Score:
0.27