CVE-2026-106486: linuxfoundation backstage\/plugin-scaffolder-backend-module-bitbucket-cloud, linuxfoundation backstage\/plugin-scaffolder-backend-module-bitbucket-server, linuxfoundation backstage

CVSS 9.9 (critical) · published 2026-10-06

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 products (NVD): linuxfoundation backstage\/plugin-scaffolder-backend-module-bitbucket-cloud, linuxfoundation backstage\/plugin-scaffolder-backend-module-bitbucket-server, linuxfoundation backstage

Fixed in (NVD): 0.3.10, 0.2.25, 1.54.6

Weakness: CWE-22, CWE-59

Source: NVD CVE-2026-106486

References

• https://github.com/backstage/backstage/commit/818528e112c36167d76187e9e63fb518399c4dd2
• https://github.com/backstage/backstage/releases/tag/v1.54.6
• https://github.com/backstage/backstage/security/advisories/GHSA-g8rx-f7m5-7794

Check your software

Connect an AI agent to the FixLane MCP server or ask the Telegram bot to check what you have installed against incidents with a verified fixed version.