CVE-2026-106487 — Backstage is an open framework for building developer portals.
Description
Backstage is an open framework for building developer portals. Prior to 0.21.10, the @backstage/plugin-kubernetes-backend package is affected by unsupported catalog cluster authentication mode in kubernetes backend. Deployments using catalog cluster discovery may be affected when catalog contributors can create or modify kubernetes-cluster Resource entities. With the required endpoint permissions and pod RBAC, the backend can use its local in-cluster identity, potentially exposing Kubernetes resources readable by that identity. The credential is used only with the local in-cluster API endpoint and is not sent to the catalog-supplied endpoint. This issue is fixed in version 0.21.10.
CVSS v3.1 base metrics
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:NLow severity
Band computed from the CVSS base score, not the source's own label — so it means the same thing across every feed.
AV
Network
Attack Vector
AC
High
Attack Complexity
PR
Low
Privileges Required
UI
None
User Interaction
S
Changed
Scope
C
Low
Confidentiality
I
None
Integrity
A
None
Availability
Affected
- Vendor
- npm
- Product
- @backstage/plugin-kubernetes-backend
Versions
- pkg:npm/%40backstage/plugin-kubernetes-backend < 0.21.10
Stated as the source expressed them.
References
- otherOSV webhttps://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946
- otherOSV webhttps://github.com/backstage/backstage/releases/tag/v1.54.6
- otherOSV webhttps://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr
- advisoryOSV GHSA-h53x-hjx6-25grhttps://osv.dev/vulnerability/GHSA-h53x-hjx6-25gr
- advisoryOSV advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-106487
- vendorOSV packagehttps://github.com/backstage/backstage
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