CVE-2026-106494 Backstage: Improper input validation in cloud storage URL readers
An attacker with cloud storage write access can craft object names to overwrite protected files, potentially leading to content injection or code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-106494?
CVE-2026-106494 is a medium-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 0.17.8, the @backstage/backend-defaults package is affected by improper input validation in cloud storage url readers. An attacker with write access to a cloud storage bucket used by Backstage could craft object names that could collide with protected files in the output directory. In certain deployment configurations, this could lead to content injection. This issue is fixed in version 0.17.8.
Which versions are affected by CVE-2026-106494?
2 open source packages ship an affected version, including @backstage/backend-defaults. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
@backstage/backend-defaults npm | All versions | 0.17.8 |
@backstage/backend-defaults npm | All versions | 0.17.8 |
Products include Linuxfoundation Backstage, Linuxfoundation Backstage\/Backend Defaults.
How do I fix CVE-2026-106494?
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-2026-106494 being exploited?
There is no known exploitation of CVE-2026-106494 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-7649-wm97-w3j3.