Answer in brief
CVE-2026-106459 records a High severity (CVSS 8.5) vulnerability in Backstage: Improper input validation in Sentry scaffolder actions. The current sources do not mark it as known exploited. The current feed maps backstage/backstage (generic), @backstage/plugin-scaffolder-backend-module-sentry (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 8.5. 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-module-sentry (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| backstage/backstagegeneric | >=1.47.0 <1.54.8 | 1.54.8 |
| @backstage/plugin-scaffolder-backend-module-sentrygeneric | >=0.3.0 <0.3.8 | 0.3.8 |
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. From 0.3.0 until 0.3.8, the @backstage/plugin-scaffolder-backend-module-sentry package is affected by improper input validation in sentry scaffolder actions. An authenticated internal user who can execute the affected actions may cause the backend to contact unintended destinations and disclose Sentry integration credentials. Subsequent impact depends on network reachability and the privileges granted to the configured token. This issue is fixed in version 0.3.8.
Quoted source text, attributed separately from HOL analysis.