CVE-2026-106486

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

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.

Scores

Weaknesses (CWE)

• CWE-22
• CWE-59

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:*:* < 0.3.10
• cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend-module-bitbucket-server:*:*:*:*:*:node.js:*:* < 0.2.25
• cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* < 1.54.6

Affected products

References

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

Sources