CVE-2026-106506 Backstage: Improper input validation in scaffolder task list ordering
Authenticated users can infer confidential task data via improper input validation in scaffolder task list ordering.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-106506?
CVE-2026-106506 is a medium-severity vulnerability in Linuxfoundation Backstage, published on 6 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Which versions are affected by CVE-2026-106506?
2 open source packages ship an affected version, including @backstage/plugin-scaffolder-backend. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
@backstage/plugin-scaffolder-backend npm | All versions | 4.1.0 |
@backstage/plugin-scaffolder-backend npm | All versions | 4.1.0 |
Products include Linuxfoundation Backstage, Linuxfoundation Backstage\/Plugin-Scaffolder-Backend.
How do I fix CVE-2026-106506?
Upgrade @backstage/plugin-scaffolder-backend to 4.1.0 or later.
Is CVE-2026-106506 being exploited?
There is no known exploitation of CVE-2026-106506 in the wild and no public exploit code.
Other vulnerabilities in Linuxfoundation Backstage
- CVE-2026-106501 Backstage: Sensitive information exposure in Scaffolder
- CVE-2026-106558 Backstage: Improper validation of TechDocs MkDocs configuration
- CVE-2026-88064 Backstage: Improper input validation in TechDocs MkDocs configuration
- CVE-2026-106459 Backstage: Improper input validation in Sentry scaffolder actions
- CVE-2026-106486 Backstage: Improper filesystem validation in Bitbucket pull-request scaffolder actions
Sources
Also known as GHSA-vwp5-f99x-x3rq.