Answer in brief
CVE-2026-106503 records a High severity (CVSS 8.1) vulnerability in Backstage: Scaffolder action input authorization bypass. The current sources do not mark it as known exploited. The current feed maps backstage/backstage (generic), @backstage/plugin-scaffolder-backend (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps backstage/backstage (generic), @backstage/plugin-scaffolder-backend (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| backstage/backstagegeneric | <1.49.6 || >=1.50.0-next.0 <1.50.5 || >=1.51.0-next.0 <1.54.6 | 1.49.6, 1.50.5, 1.54.6 |
| @backstage/plugin-scaffolder-backendgeneric | <3.3.1 || >=3.4.0 <3.4.1 || >=4.0.0 <4.0.3 || >=4.0.4 <4.1.0 | 3.3.1, 3.4.1, 4.0.3, 4.1.0 |
Published upstream
Oct 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 6, 2026
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 scaffolder action input authorization bypass. An authenticated user with access to affected Scaffolder templates could bypass configured action restrictions. Depending on integration credentials, this could grant unauthorized access to repositories and related source-control resources. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.
Quoted source text, attributed separately from HOL analysis.