CVE-2026-106493 Backstage: Cloud storage catalog locations may cross configured storage boundaries
Attackers can read catalog descriptors from outside intended storage boundaries in Backstage cloud storage providers, exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-106493?
CVE-2026-106493 is a low-severity path traversal vulnerability in Linuxfoundation Backstage, published on 6 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Backstage is an open framework for building developer portals. Prior to 1.54.6, cloud storage catalog providers did not sufficiently validate object paths. A principal able to create or rename objects in a configured Azure Blob Storage or AWS S3 catalog source could cause catalog descriptors to be read from outside the intended storage boundary, limited to locations reachable with the backend's configured credentials. This issue is fixed in 1.54.6.
Weakness: CWE-22
Which versions are affected by CVE-2026-106493?
6 open source packages ship an affected version, including @backstage/backend-defaults, @backstage/plugin-catalog-backend-module-aws and @backstage/plugin-catalog-backend-module-azure. It affects 4 products.
| Package | Affected | Fixed in |
|---|---|---|
@backstage/backend-defaults npm | All versions | 0.17.8 |
@backstage/backend-defaults npm | All versions | 0.17.8 |
@backstage/plugin-catalog-backend-module-aws npm | All versions | 0.4.27 |
@backstage/plugin-catalog-backend-module-aws npm | All versions | 0.4.27 |
@backstage/plugin-catalog-backend-module-azure npm | All versions | 0.3.21 |
@backstage/plugin-catalog-backend-module-azure npm | All versions | 0.3.21 |
Products include Linuxfoundation Backstage, Linuxfoundation Backstage\/Backend-Defaults, Linuxfoundation Backstage\/Plugin-Catalog-Backend-Module-Aws, Linuxfoundation Backstage\/Plugin-Catalog-Backend-Module-Azure.
How do I fix CVE-2026-106493?
Upgrade @backstage/backend-defaults to 0.17.8 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-106493 being exploited?
There is no known exploitation of CVE-2026-106493 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-xvh9-35w9-42m4.