CVE-2026-106486

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.

CVSS 3.1

9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS

0.4% chance of exploitation in the next 30 days; higher than 30% of CVEs (scores of 2026-10-25)

CWEs

CWE-22, CWE-59

Published

2026-10-06

Modified

2026-10-23

Record from

the NVD, synced 2026-10-23

Affected

• linuxfoundation:backstage
• linuxfoundation:backstage\/plugin-scaffolder-backend-module-bitbucket-cloud
• linuxfoundation:backstage\/plugin-scaffolder-backend-module-bitbucket-server

Packages (OSV)

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

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