CVE-2026-106563

medium

Backstage is an open framework for building developer portals.

Vendor / product: Linuxfoundation — backstage\/plugin-kubernetes-backend

Backstage is an open framework for building developer portals. Prior to 0.21.8, the @backstage/plugin-kubernetes-backend package is affected by improper entity validation in deprecated kubernetes services endpoint. An authenticated user with Kubernetes read permissions could access Kubernetes workload data beyond their intended scope by supplying crafted entity data to the deprecated services endpoint. The exposure is limited to read-only access to Kubernetes object metadata across configured clusters. This issue is fixed in version 0.21.8.

CVSS

6.5

6.5 (CVSS v3.1)

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

Severity source: NVD CVSS v3.1 (nvd@nist.gov)

Timeline (UTC)

Published: 2026-10-07 15:17

Modified: 2026-10-16 14:50

NVD status: Analyzed

Last synced 2 days ago

Verified against the source API 2026-10-27 06:58 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

linuxfoundation / backstage\/plugin-kubernetes-backend <0.21.8

linuxfoundation / backstage <1.54.1

Weakness classification (CWE)

CWE-20 CWE-862

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://github.com/backstage/backstage/security/advisories/GHSA-r9ph-3637-55px

Patch / mitigation: https://github.com/backstage/backstage/commit/2d5d3e77d630455d6d48cfa8f31fd3c126fd6f29

Patch / mitigation: https://github.com/backstage/backstage/releases/tag/v1.54.1

Patch / mitigation: https://github.com/backstage/backstage/security/advisories/GHSA-r9ph-3637-55px

References

https://github.com/backstage/backstage/commit/2d5d3e77d630455d6d48cfa8f31fd3c126fd6f29 security-advisories@github.com
https://github.com/backstage/backstage/releases/tag/v1.54.1 security-advisories@github.com
https://github.com/backstage/backstage/security/advisories/GHSA-r9ph-3637-55px security-advisories@github.com

Data sources

NVD CVE API 2.0 — fetched 2026-10-27 06:58 UTC · record ↗

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CVE-2026-106563

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Weakness classification (CWE)

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References

Data sources

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