Backstage: Improper preservation of access restrictions during service credential delegation

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-106492
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 21:17:18 UTC
Updated2026-10-06 21:17:18 UTC
DescriptionBackstage 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.

Risk And Classification

Primary CVSS: v3.1 7.6 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

Problem Types: CWE-269 | CWE-863 | CWE-269 CWE-269: Improper Privilege Management | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.6HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
3.1CNADECLARED7.6HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Backstage Backstage affected < 1.49.6 Not specified
CNA Backstage Backstage affected >= 1.50.0-next.0, < 1.54.6 Not specified
CNA @backstage Backend-defaults affected < 0.16.1 Not specified
CNA @backstage Backend-defaults affected >= 0.17.0, < 0.17.8 Not specified

References

ReferenceSourceLinkTags
github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab... [email protected] github.com
github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.49.6 [email protected] github.com
github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb86... [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.54.6 [email protected] github.com
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