CVE-2026-106506

Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by improper input validation in scaffolder task list ordering. An authenticated Backstage user with permission to create and read relevant scaffolder tasks may be able to infer confidential task data under specific conditions. Successful exploitation requires retained task secrets, visibility of a target task, knowledge of the secret structure, and repeated requests. This issue is fixed in version 4.1.0.

CVSS 3.1

5.3CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 12% of CVEs (scores of 2026-10-25)

CWEs

CWE-202, CWE-203

Published

2026-10-06

Modified

2026-10-09

Record from

the NVD, synced 2026-10-19

Affected

• linuxfoundation:backstage
• linuxfoundation:backstage\/plugin-scaffolder-backend

Packages (OSV)

References

• https://github.com/backstage/backstage/commit/e673a869449874a9169e8f89852e75e862011b93
• https://github.com/backstage/backstage/releases/tag/v1.54.6
• https://github.com/backstage/backstage/security/advisories/GHSA-vwp5-f99x-x3rq

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