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Backstage: Improper input validation in cloud storage URL readers

Type: advisorySource: Official CVE List1 source record

Backstage is an open framework for building developer portals. Prior to 0.17.8, the @backstage/backend-defaults package is affected by improper input validation in cloud storage url readers. An attacker with write access to a cloud storage bucket used by Backstage could craft object names that could collide with protected files in the output directory. In certain deployment configurations, this could lead to content injection. This issue is fixed in version 0.17.8.

Announced Source revision 1
Original source ↗

CVE-2026-106494

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-2026-106494

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

backend-defaults

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": "< 1.54.6"
      }
    ]
  },
  {
    "vendor": "@backstage",
    "product": "backend-defaults",
    "versions": [
      {
        "status": "affected",
        "version": "< 0.17.8"
      }
    ]
  }
]
Related CVEs
CVE-2026-106494

Source reference: /cveMetadata/cveId

Publisher severity

medium

Source reference: /containers/cna/metrics

Event
#11935 · Revision 1
Added to Heist Feed
Publisher date
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