{"id":"CVE-2026-106563","aliases":["EUVD-2026-94376","GHSA-r9ph-3637-55px"],"status":"published","title":"Backstage: Improper entity validation in deprecated Kubernetes services endpoint","description":"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.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00225,"percentile":0.13191,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20","CWE-862"],"published":"2026-10-07T14:56:08Z","modified":"2026-10-28T02:30:40Z","fixes":[{"ecosystem":"npm","package":"@backstage/plugin-kubernetes-backend","fixed_in":["0.21.8"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@backstage/plugin-kubernetes-backend","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.21.8"}]}]},{"source":"osv","ecosystem":"npm","package":"@backstage/plugin-kubernetes-backend","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.21.8"}]}]}],"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-r9ph-3637-55px","tags":["x_refsource_CONFIRM","Mitigation","Vendor Advisory","advisory","web"]},{"url":"https://github.com/backstage/backstage/commit/2d5d3e77d630455d6d48cfa8f31fd3c126fd6f29","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.1","tags":["x_refsource_MISC","Patch","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106563","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-r9ph-3637-55px"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106563.json","tags":["advisory"]},{"url":"https://github.com/backstage/backstage","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-106563","title":"Backstage: Improper entity validation in deprecated Kubernetes services endpoint","description":"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.","status":"published","published":"2026-10-07T14:56:08.067Z","modified":"2026-10-10T02:28:55.359Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-20","CWE-862"],"updated_at":"2026-11-02T14:20:04.463704Z"}],"euvd":[{"id":"EUVD-2026-94376","description":"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.","status":"published","published":"2026-10-07T14:56:08Z","modified":"2026-10-10T02:28:55Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T17:27:24.157251Z"}],"ghsa":[{"id":"GHSA-r9ph-3637-55px","title":"Backstage: Improper entity validation in deprecated Kubernetes services endpoint","description":"### Impact\n\nAn 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.\n\n### Patches\n\nPatched in `@backstage/plugin-kubernetes-backend` version 0.21.8.\n\n### Workarounds\n\n- Disable the deprecated `/services/:serviceId` route by deploying a custom Kubernetes router that omits it.\n- Restrict access to the `kubernetes.resources.read` permission to limit the set of users who can reach the endpoint.","status":"published","published":"2026-10-07T18:02:37Z","modified":"2026-10-07T18:02:40Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-20","CWE-862"],"updated_at":"2026-11-02T14:41:28.013673Z"}],"nvd":[{"id":"CVE-2026-106563","description":"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.","status":"published","published":"2026-10-07T15:17:17.86Z","modified":"2026-10-16T14:50:31.303Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-20","CWE-862"],"updated_at":"2026-11-02T14:12:54.809359Z"}],"osv":[{"id":"CVE-2026-106563","title":"Backstage: Improper entity validation in deprecated Kubernetes services endpoint","description":"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.","status":"published","published":"2026-10-07T14:56:08.067Z","modified":"2026-10-28T02:30:40.643788081Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-20","CWE-862"],"updated_at":"2026-11-02T15:44:54.583213Z"},{"id":"GHSA-r9ph-3637-55px","title":"Backstage: Improper entity validation in deprecated Kubernetes services endpoint","description":"### Impact\n\nAn 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.\n\n### Patches\n\nPatched in `@backstage/plugin-kubernetes-backend` version 0.21.8.\n\n### Workarounds\n\n- Disable the deprecated `/services/:serviceId` route by deploying a custom Kubernetes router that omits it.\n- Restrict access to the `kubernetes.resources.read` permission to limit the set of users who can reach the endpoint.","status":"published","published":"2026-10-07T18:02:37Z","modified":"2026-10-07T18:15:11.761928207Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-20","CWE-862"],"updated_at":"2026-11-02T15:46:55.480549Z"}]}}