CVE-2026-106500Backstage: Improper task state validation in Scaffolder backend
Updated under an hour ago ()
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It affects backstage and 3 other products. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.34%, higher than 25% of scored CVEs.
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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 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.
- CVSS
- 8.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-59, CWE-362
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.34% (percentile 25)
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Oct 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
backstage backstage backstage:backstage (from the name) | before 1.49.6; from 1.50.0-next.0, < 1.50.5; from 1.51.0-next.0, < 1.54.6 | CNA record |
@backstage plugin-scaffolder-backend backstage:plugin_scaffolder_backend (from the name) | before 3.3.1; from 3.4.0, < 3.4.1; from 4.0.0, < 4.0.3; from 4.0.4, < 4.1.0 | CNA record |
linuxfoundation backstage/plugin-scaffolder-backend linuxfoundation:backstage/plugin-scaffolder-backend | before 3.3.1; from 3.4.0 before 3.4.1; from 4.0.0 before 4.0.3; from 4.0.4 before 4.1.0 | NVD |
linuxfoundation backstage linuxfoundation:backstage | before 1.49.6; from 1.50.0 before 1.50.5; from 1.51.0 before 1.54.6 | NVD |
References
- https://github.com/backstage/backstage/security/advisories/GHSA-xvgh-hmx8-9xxfx-refsource-confirm, mitigation, vendor-advisory
- https://github.com/backstage/backstage/commit/0d24f1b8701f3dde6cd597f81997c1ea873a43aex-refsource-misc, patch
- https://github.com/backstage/backstage/commit/56be299dd3ef6706e13e76ea2f8a9b0dd0b6413dx-refsource-misc, patch
- https://github.com/backstage/backstage/commit/9e86c95a1a3ddfd54db03731cd8678aa63495175x-refsource-misc, patch
- https://github.com/backstage/backstage/releases/tag/v1.49.6x-refsource-misc, patch, release-notes
- https://github.com/backstage/backstage/releases/tag/v1.50.5x-refsource-misc, patch, release-notes
- https://github.com/backstage/backstage/releases/tag/v1.54.6x-refsource-misc, patch, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.