{"id":"CVE-2026-106500","title":"Backstage is an open framework for building developer portals","summary":"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 improper task state validation in scaffolder backend. An authenticated…","severity":"high","cvss":8.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","cwe":["CWE-59","CWE-362","CWE-367"],"vendor":"linuxfoundation","product":"backstage/plugin-scaffolder-backend","affected":["backstage/plugin-scaffolder-backend < 3.3.1","backstage/plugin-scaffolder-backend >= 3.4.0, < 3.4.1","backstage/plugin-scaffolder-backend >= 4.0.0, < 4.0.3","backstage/plugin-scaffolder-backend >= 4.0.4, < 4.1.0","backstage < 1.49.6","backstage >= 1.50.0, < 1.50.5","backstage >= 1.51.0, < 1.54.6"],"patched":["backstage/plugin-scaffolder-backend 4.1.0","backstage 1.54.6"],"published":"2026-10-06","updated":"2026-10-13","sourceUpdated":"2026-10-13T14:38:24.900","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-106500","references":[{"url":"https://github.com/backstage/backstage/commit/0d24f1b8701f3dde6cd597f81997c1ea873a43ae","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/commit/56be299dd3ef6706e13e76ea2f8a9b0dd0b6413d","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/commit/9e86c95a1a3ddfd54db03731cd8678aa63495175","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.49.6","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.50.5","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-xvgh-hmx8-9xxf","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106500.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-106500"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2547216"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-106500"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106500"},{"url":"https://github.com/advisories/GHSA-xvgh-hmx8-9xxf"}],"tags":["nvd","cve.org","csaf","vex","red-hat","ghsa","npm"],"epss":0.00336,"epssPercentile":0.2686,"aliases":["GHSA-xvgh-hmx8-9xxf"],"ecosystem":"npm","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-07T15:47:41.478403Z"},"scores":{"nvd":8.5,"vendor":7.1,"ghsa":8.5},"ingestedAt":"2026-10-06T22:23:15.966Z","slug":"CVE-2026-106500","body":"## Overview\n\nBackstage 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 improper task state validation in scaffolder backend. An authenticated user with permission to create and access Scaffolder tasks may, under specific timing and deployment conditions, affect files accessible to the Backstage backend. If backend application files are writable, the confidentiality, integrity, and availability of the backend may be compromised. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.\n\n## Affected\n\n- `backstage/plugin-scaffolder-backend < 3.3.1`\n- `backstage/plugin-scaffolder-backend >= 3.4.0, < 3.4.1`\n- `backstage/plugin-scaffolder-backend >= 4.0.0, < 4.0.3`\n- `backstage/plugin-scaffolder-backend >= 4.0.4, < 4.1.0`\n- `backstage < 1.49.6`\n- `backstage >= 1.50.0, < 1.50.5`\n- `backstage >= 1.51.0, < 1.54.6`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `backstage/plugin-scaffolder-backend 4.1.0`\n- `backstage 1.54.6`\n\n## Package advisory (CVE-2026-106500)\n\nAffected packages:\n\n- `@backstage/plugin-scaffolder-backend < 4.1.0`\n\nPatched in:\n\n- `@backstage/plugin-scaffolder-backend 4.1.0`\n\nSource: https://github.com/advisories/GHSA-xvgh-hmx8-9xxf\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Developer Hub, Self-service automation portal 2 · no fix planned: Red Hat Developer Hub, Self-service automation portal 2 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106500.json)","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":46.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}