CVE-2026-106488
Published:October 06, 2026
Updated:October 09, 2026
Backstage is an open framework for building developer portals. Prior to 0.4.20, the @backstage/plugin-auth-backend-module-oidc-provider package is affected by improper authentication in the oidc provider. Deployments using OIDC email-based identity resolution with a provider that permits unverified email addresses may allow an authenticated provider user to assume another catalog identity. This may grant access and permissions associated with that user. No direct availability impact is demonstrated. This issue is fixed in version 0.4.20.
Affected Packages
https://github.com/backstage/backstage.git (GITHUB):
Affected version(s) >=v1.23.0 <v1.54.6Fix Suggestion:
Update to version v1.54.6@backstage/plugin-auth-backend-module-oidc-provider (NPM):
Affected version(s) >=0.0.0-nightly-20240122021809 <0.4.20Fix Suggestion:
Update to version 0.4.20@backstage/plugin-auth-backend-module-oidc-provider (NPM):
Affected version(s) >=0.1.0 <0.4.20Fix Suggestion:
Update to version 0.4.20Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.6
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Authentication
EPSS
Base Score:
0.28