{"id":"CVE-2026-106501","aliases":["EUVD-2026-94059","GHSA-g2v8-7jhw-pp8p"],"status":"published","title":"Backstage: Sensitive information exposure in Scaffolder","description":"Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder. An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.","severity":{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00484,"percentile":0.4201,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-200","CWE-201"],"published":"2026-10-06T21:32:25Z","modified":"2026-10-28T02:30:58Z","fixes":[{"ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","fixed_in":["3.3.1","3.4.1","4.0.3","4.1.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.1"}]}]},{"source":"ghsa","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.4.0"},{"fixed":"3.4.1"}]}]},{"source":"ghsa","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.0.3"}]}]},{"source":"ghsa","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.4"},{"fixed":"4.1.0"}]}]},{"source":"osv","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.3.1"}]}]},{"source":"osv","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"SEMVER","events":[{"introduced":"3.4.0"},{"fixed":"3.4.1"}]}]},{"source":"osv","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.0"},{"fixed":"4.0.3"}]}]},{"source":"osv","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.4"},{"fixed":"4.1.0"}]}]}],"products":[{"vendor":"@backstage","product":"plugin-scaffolder-backend"},{"vendor":"backstage","product":"backstage"},{"vendor":"linuxfoundation","product":"backstage"},{"vendor":"linuxfoundation","product":"backstage\\/plugin-scaffolder-backend"}],"references":[{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-g2v8-7jhw-pp8p","tags":["x_refsource_CONFIRM","Mitigation","Vendor Advisory","advisory","web"]},{"url":"https://github.com/backstage/backstage/commit/66d2219edf0abe33ab7d0c1ced5d069d1e065be5","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/backstage/backstage/commit/c19838870476a8e29144c84b1a5ac0654ec20fb5","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/backstage/backstage/commit/e262d649981ff99bb01ca7077807ae3e25e85560","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.49.6","tags":["x_refsource_MISC","Patch","Release Notes","web"]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.50.5","tags":["x_refsource_MISC","Patch","Release Notes","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-2026-106501","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-g2v8-7jhw-pp8p"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106501.json","tags":["advisory"]},{"url":"https://github.com/backstage/backstage","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-106501","title":"Backstage: Sensitive information exposure in Scaffolder","description":"Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder. An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.","status":"published","published":"2026-10-06T21:32:25.997Z","modified":"2026-10-07T17:06:36.85Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"critical","assessor":"cna"}],"cwes":["CWE-200","CWE-201"],"updated_at":"2026-11-02T14:20:04.463704Z"}],"euvd":[{"id":"EUVD-2026-94059","description":"Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder. An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.","status":"published","published":"2026-10-06T21:32:25Z","modified":"2026-10-07T17:06:36Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T17:27:34.815018Z"}],"ghsa":[{"id":"GHSA-g2v8-7jhw-pp8p","title":"Backstage: Sensitive information exposure in Scaffolder","description":"### Impact\n\nAn authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service.\n\n### Patches\n\nPatched in `@backstage/plugin-scaffolder-backend` version `4.1.0`\n\n### Workarounds\n\n- Configure `scaffolder.task.read` with the `isTaskOwner` condition so users can only read tasks they created.\n- Restrict affected integrations and workflows to trusted operators until an upgrade is available.","status":"published","published":"2026-10-07T17:59:19Z","modified":"2026-10-07T17:59:20Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-200","CWE-201"],"updated_at":"2026-11-02T14:41:28.013673Z"}],"nvd":[{"id":"CVE-2026-106501","description":"Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder. An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.","status":"published","published":"2026-10-06T22:17:05.217Z","modified":"2026-10-13T14:38:15.587Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"critical","assessor":"secondary"}],"cwes":["CWE-200","CWE-201"],"updated_at":"2026-11-02T14:12:54.809359Z"}],"osv":[{"id":"CVE-2026-106501","title":"Backstage: Sensitive information exposure in Scaffolder","description":"Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder. An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.","status":"published","published":"2026-10-06T21:32:25.997Z","modified":"2026-10-28T02:30:58.01722948Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-200","CWE-201"],"updated_at":"2026-11-02T15:44:54.583213Z"},{"id":"GHSA-g2v8-7jhw-pp8p","title":"Backstage: Sensitive information exposure in Scaffolder","description":"### Impact\n\nAn authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service.\n\n### Patches\n\nPatched in `@backstage/plugin-scaffolder-backend` version `4.1.0`\n\n### Workarounds\n\n- Configure `scaffolder.task.read` with the `isTaskOwner` condition so users can only read tasks they created.\n- Restrict affected integrations and workflows to trusted operators until an upgrade is available.","status":"published","published":"2026-10-07T17:59:19Z","modified":"2026-10-07T18:15:10.728715918Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-200","CWE-201"],"updated_at":"2026-11-02T15:46:47.119724Z"}]}}