{"id":"CVE-2026-106487","aliases":["EUVD-2026-94005","GHSA-h53x-hjx6-25gr"],"status":"published","title":"Backstage: Unsupported catalog cluster authentication mode in kubernetes backend","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.","severity":{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00263,"percentile":0.18283,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-441"],"published":"2026-10-06T20:36:45Z","modified":"2026-10-28T02:30:34Z","fixes":[{"ecosystem":"npm","package":"@backstage/plugin-kubernetes-backend","fixed_in":["0.21.10"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@backstage/plugin-kubernetes-backend","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.21.10"}]}]},{"source":"osv","ecosystem":"npm","package":"@backstage/plugin-kubernetes-backend","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.21.10"}]}]}],"products":[{"vendor":"@backstage","product":"plugin-kubernetes-backend"},{"vendor":"backstage","product":"backstage"},{"vendor":"linuxfoundation","product":"backstage"},{"vendor":"linuxfoundation","product":"backstage\\/plugin-kubernetes-backend"}],"references":[{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr","tags":["x_refsource_CONFIRM","Mitigation","Vendor Advisory","advisory","web"]},{"url":"https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","tags":["x_refsource_MISC","Patch","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106487","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-h53x-hjx6-25gr"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106487.json","tags":["advisory"]},{"url":"https://github.com/backstage/backstage","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-106487","title":"Backstage: Unsupported catalog cluster authentication mode in kubernetes backend","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.","status":"published","published":"2026-10-06T20:36:45.419Z","modified":"2026-10-09T01:49:45.471Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-441"],"updated_at":"2026-11-02T14:20:04.463704Z"}],"euvd":[{"id":"EUVD-2026-94005","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.","status":"published","published":"2026-10-06T20:36:45Z","modified":"2026-10-09T01:49:45Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low"}],"updated_at":"2026-11-02T17:27:25.459601Z"}],"ghsa":[{"id":"GHSA-h53x-hjx6-25gr","title":"Backstage: Unsupported catalog cluster authentication mode in kubernetes backend","description":"### Impact\n\nDeployments 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.\n\n### Patches\n\nPatched in `@backstage/plugin-kubernetes-backend` version `0.21.10`\n\n### Workarounds\n\n- Do not configure service account authentication through catalog-provided clusters; use the supported static configuration method when service account authentication is required.\n- Restrict catalog ingestion so untrusted users cannot create or alter Kubernetes cluster Resource entities.","status":"published","published":"2026-10-07T18:01:08Z","modified":"2026-10-07T18:01:09Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-441"],"updated_at":"2026-11-02T14:41:28.013673Z"}],"nvd":[{"id":"CVE-2026-106487","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.","status":"published","published":"2026-10-06T21:17:17.477Z","modified":"2026-10-22T18:49:32.183Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low","assessor":"secondary"},{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-441"],"updated_at":"2026-11-02T14:12:54.809359Z"}],"osv":[{"id":"CVE-2026-106487","title":"Backstage: Unsupported catalog cluster authentication mode in kubernetes backend","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.","status":"published","published":"2026-10-06T20:36:45.419Z","modified":"2026-10-28T02:30:34.650725793Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-441"],"updated_at":"2026-11-02T15:44:54.583213Z"},{"id":"GHSA-h53x-hjx6-25gr","title":"Backstage: Unsupported catalog cluster authentication mode in kubernetes backend","description":"### Impact\n\nDeployments 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.\n\n### Patches\n\nPatched in `@backstage/plugin-kubernetes-backend` version `0.21.10`\n\n### Workarounds\n\n- Do not configure service account authentication through catalog-provided clusters; use the supported static configuration method when service account authentication is required.\n- Restrict catalog ingestion so untrusted users cannot create or alter Kubernetes cluster Resource entities.","status":"published","published":"2026-10-07T18:01:08Z","modified":"2026-10-07T18:15:12.170259633Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-441"],"updated_at":"2026-11-02T15:46:48.546324Z"}]}}