CVE-2026-106486
Backstage: Improper filesystem validation in Bitbucket pull-request scaffolder actions
At a glance
- Source
- NVD
- EPSS
- EPSS 0.37 % · percentile 30 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Analyzed
Description
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.
Weaknesses (CWE)
- CWE-22 — Improper Limitation of a Pathname to a Restricted Directory
- CWE-59 — Improper Link Resolution Before File Access
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H | GitHub_M |
| CVSS 3.1 | HIGH 8.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H | NVD · security-advisories@github.com (Secondary) |
| CVSS 3.1 | CRITICAL 9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H | NVD · nvd@nist.gov (Primary) |
Advisories
- GHSA-g8rx-f7m5-7794 — Backstage has iImproper filesystem validation in Bitbucket pull-request scaffolder actions
European references
- ENISA EUVD · EUVD-2026-94003
- GCVE · GCVE-0-2026-106486
Affected configurations (NVD CPE)
cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend-module-bitbucket-cloud:*:*:*:*:*:node.js:*:*< 0.3.10cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend-module-bitbucket-server:*:*:*:*:*:node.js:*:*< 0.2.25cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*< 1.54.6
Affected products
| Product | Versions |
|---|---|
| backstage · backstage | affected < 1.54.6 |
| @backstage · plugin-scaffolder-backend-module-bitbucket-cloud | affected < 0.3.10 |
| @backstage · plugin-scaffolder-backend-module-bitbucket-server | affected < 0.2.25 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |