Backstage: Improper task state validation in Scaffolder backend
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.
CVE-2026-106500
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-106500
backstage
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
plugin-scaffolder-backend
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "backstage",
"product": "backstage",
"versions": [
{
"status": "affected",
"version": "< 1.49.6"
},
{
"status": "affected",
"version": ">= 1.50.0-next.0, < 1.50.5"
},
{
"status": "affected",
"version": ">= 1.51.0-next.0, < 1.54.6"
}
]
},
{
"vendor": "@backstage",
"product": "plugin-scaffolder-backend",
"versions": [
{
"status": "affected",
"version": "< 3.3.1"
},
{
"status": "affected",
"version": ">= 3.4.0, < 3.4.1"
},
{
"status": "affected",
"version": ">= 4.0.0, < 4.0.3"
},
{
"status": "affected",
"version": ">= 4.0.4, < 4.1.0"
}
]
}
]- Related CVEs
- CVE-2026-106500
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #11946 · Revision 1
- Added to Heist Feed
- Publisher date