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Backstage: Improper filesystem validation in Bitbucket pull-request scaffolder actions

Type: advisorySource: Official CVE List1 source record

Backstage is an open framework for building developer portals. Prior to 0.3.10 in @backstage/plugin-scaffolder-backend-module-bitbucket-cloud and 0.2.25 in @backstage/plugin-scaffolder-backend-module-bitbucket-server, the Bitbucket pull-request Scaffolder actions did not sufficiently validate filesystem paths. An authenticated user who can execute an eligible template and influence an allowed Bitbucket repository could affect paths outside the expected working area, potentially compromising backend confidentiality, integrity, or availability. This issue is fixed in @backstage/plugin-scaffolder-backend-module-bitbucket-cloud 0.3.10 and @backstage/plugin-scaffolder-backend-module-bitbucket-server 0.2.25.

Announced Source revision 1
Original source ↗

CVE-2026-106486

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-2026-106486

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-module-bitbucket-cloud

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

plugin-scaffolder-backend-module-bitbucket-server

Source reference: /containers/cna/affected/2/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": "plugin-scaffolder-backend-module-bitbucket-cloud",
    "versions": [
      {
        "status": "affected",
        "version": "< 0.3.10"
      }
    ]
  },
  {
    "vendor": "@backstage",
    "product": "plugin-scaffolder-backend-module-bitbucket-server",
    "versions": [
      {
        "status": "affected",
        "version": "< 0.2.25"
      }
    ]
  }
]
Related CVEs
CVE-2026-106486

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#11971 · Revision 1
Added to Heist Feed
Publisher date
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