CVE-2026-106492
Published:October 06, 2026
Updated:October 09, 2026
Backstage is an open framework for building developer portals. Prior to 0.16.1 and 0.17.8, the @backstage/backend-defaults package is affected by improper preservation of access restrictions during service credential delegation. An external service credential configured with access restrictions (e.g., read-only) could bypass those restrictions by routing requests through plugin delegation paths. This could allow a restricted service to perform operations beyond its intended scope, including write operations on plugins it was restricted to read-only access for. This issue is fixed in versions 0.16.1 and 0.17.8.
Affected Packages
https://github.com/backstage/backstage.git (GITHUB):
Affected version(s) >=v1.28.1 <v1.49.6Fix Suggestion:
Update to version v1.49.6https://github.com/backstage/backstage.git (GITHUB):
Affected version(s) >=v1.50.0 <v1.54.6Fix Suggestion:
Update to version v1.54.6@backstage/backend-defaults (NPM):
Affected version(s) >=0.3.1 <0.16.1Fix Suggestion:
Update to version 0.16.1@backstage/backend-defaults (NPM):
Affected version(s) >=0.16.1-next.0 <0.17.8Fix Suggestion:
Update to version 0.17.8@backstage/backend-defaults (NPM):
Affected version(s) >=0.0.0-nightly-20220811024336 <0.17.8Fix Suggestion:
Update to version 0.17.8Related Resources (8)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.2
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
HIGH
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.6
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
LOW
EPSS
Base Score:
0.24