Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M
CVE-2026-106506Backstage: Improper input validation in scaffolder task list ordering
Medium 5.3
In plain English
A medium-severity security flaw in backstage from backstage. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @backstage/plugin-scaffolder-backend | 4.1.0 | GHSA-vwp5-f99x-x3rq |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| backstage | backstage | < 1.54.6 |
| @backstage | plugin-scaffolder-backend | < 4.1.0 |
Weakness: CWE-202, CWE-203 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N