CVE-2026-106500
Backstage: Improper task state validation in Scaffolder backend
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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 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.
Timeline
ID reserved
By GitHub_M
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High8.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | High8.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.34% · top 73% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.5.
Weakness
Affected products
- affected < 1.49.6
- affected >= 1.50.0-next.0, < 1.50.5
- affected >= 1.51.0-next.0, < 1.54.6
@backstage · plugin-scaffolder-backend
- affected < 3.3.1
- affected >= 3.4.0, < 3.4.1
- affected >= 4.0.0, < 4.0.3
- affected >= 4.0.4, < 4.1.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npm@backstage/plugin-scaffolder-backendGHSA-xvgh-hmx8-9xxf (opens in a new tab)
References (7)
- https://github.com/backstage/backstage/security/advisories/GHSA-xvgh-hmx8-9xxf (opens in a new tab)x_refsource_CONFIRM
- https://github.com/backstage/backstage/commit/0d24f1b8701f3dde6cd597f81997c1ea873a43ae (opens in a new tab)x_refsource_MISC
- https://github.com/backstage/backstage/commit/56be299dd3ef6706e13e76ea2f8a9b0dd0b6413d (opens in a new tab)x_refsource_MISC
- https://github.com/backstage/backstage/commit/9e86c95a1a3ddfd54db03731cd8678aa63495175 (opens in a new tab)x_refsource_MISC
- https://github.com/backstage/backstage/releases/tag/v1.49.6 (opens in a new tab)x_refsource_MISC
- https://github.com/backstage/backstage/releases/tag/v1.50.5 (opens in a new tab)x_refsource_MISC
- https://github.com/backstage/backstage/releases/tag/v1.54.6 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-xvgh-hmx8-9xxf (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-106500)Record last updated .