CVE-2026-106486
Backstage has iImproper filesystem validation in Bitbucket pull-request scaffolder actions
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @backstage/plugin-scaffolder-backend-module-bitbucket-cloud | < 0.3.10 | 0.3.10 |
| npm | @backstage/plugin-scaffolder-backend-module-bitbucket-server | < 0.2.25 | 0.2.25 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Linuxfoundation | Backstage\/Plugin-Scaffolder-Backend-Module-Bitbucket-Cloud | before 0.3.10 |
| Linuxfoundation | Backstage\/Plugin-Scaffolder-Backend-Module-Bitbucket-Server | before 0.2.25 |
| Linuxfoundation | Backstage | before 1.54.6 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-g8rx-f7m5-7794
- https://github.com/backstage/backstage/security/advisories/GHSA-g8rx-f7m5-7794
- https://nvd.nist.gov/vuln/detail/CVE-2026-106486
- https://github.com/backstage/backstage/commit/818528e112c36167d76187e9e63fb518399c4dd2
- https://github.com/backstage/backstage/releases/tag/v1.54.6