CVE-2026-106463 Backstage: Improper authorization in GitLab organizational user ingestion
Attackers can gain unauthorized access as a standard user by exploiting improper authorization in GitLab organizational user ingestion.
- 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-2026-106463?
CVE-2026-106463 is a medium-severity missing authorization 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 0.8.7, the @backstage/plugin-catalog-backend-module-gitlab package is affected by improper authorization in gitlab organizational user ingestion. Deployments that enable GitLab organization event ingestion and rely on scoped catalog users as an access boundary may admit an unintended catalog identity. Depending on sign-in and permission configuration, this may allow unauthorized access with the permissions of a standard authenticated user. This issue is fixed in version 0.8.7.
Weakness: CWE-863
Which versions are affected by CVE-2026-106463?
2 open source packages ship an affected version, including @backstage/plugin-catalog-backend-module-gitlab. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
@backstage/plugin-catalog-backend-module-gitlab npm | All versions | 0.8.7 |
@backstage/plugin-catalog-backend-module-gitlab npm | All versions | 0.8.7 |
Products include Linuxfoundation Backstage, Linuxfoundation Backstage\/Plugin-Catalog-Backend-Module-Gitlab.
How do I fix CVE-2026-106463?
Upgrade @backstage/plugin-catalog-backend-module-gitlab to 0.8.7 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-106463 being exploited?
There is no known exploitation of CVE-2026-106463 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-gp6m-x9vw-5c5x.