8.5
High
CVE-2026-106500 Backstage is an open framework for building developer portals
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| backstage 1.51 | 1.51.0-next.0 → < 1.54.6 | 1.54.6 |
| backstage 1.50 | 1.50.0-next.0 → < 1.50.5 | 1.50.5 |
| backstage 1.49 | earliest → < 1.49.6 | 1.49.6 |
| plugin-scaffolder-backend 4.0 | 4.0.0 → < 4.1.0 | 4.0.3 |
| plugin-scaffolder-backend 3.4 | 3.4.0 → < 3.4.1 | 3.4.1 |
| plugin-scaffolder-backend 3.3 | earliest → < 3.3.1 | 3.3.1 |
Other CVEs of backstage
The 69 CVEs of backstage →
CVE-2026-115923
Backstage is an open framework for building developer portals
6.5
Medium
CVE-2026-106495
Backstage is an open framework for building developer portals
4.3
Medium
CVE-2026-106557
Backstage is an open framework for building developer portals
7.7
High
CVE-2026-106563
Backstage is an open framework for building developer portals
5.3
Medium