Backstage: Improper URL validation in catalog entity placeholder resolution
Backstage is an open framework for building developer portals. Prior to 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1, the @backstage/plugin-catalog-backend package is affected by improper url validation in catalog entity placeholder resolution. An authenticated Backstage user could craft a catalog entity with placeholder directives that reference resources outside the entity's source repository. Under certain configurations, this could allow access to data not intended to be available to the user. This issue is fixed in versions 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1.
CVE-2026-106498
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-2026-106498
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-catalog-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, < 1.51.3"
},
{
"status": "affected",
"version": ">= 1.52.0-next.0, < 1.53.2"
},
{
"status": "affected",
"version": ">= 1.54.0-next.0, < 1.54.6"
}
]
},
{
"vendor": "@backstage",
"product": "plugin-catalog-backend",
"versions": [
{
"status": "affected",
"version": "< 3.5.1"
},
{
"status": "affected",
"version": ">= 3.6.0, < 3.6.2"
},
{
"status": "affected",
"version": ">= 3.7.0, < 3.7.2"
},
{
"status": "affected",
"version": ">= 3.8.0, < 3.8.2"
},
{
"status": "affected",
"version": ">= 3.9.0, < 3.9.1"
}
]
}
]- Related CVEs
- CVE-2026-106498
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #16159 · Revision 1
- Added to Heist Feed
- Publisher date