Backend defaults: Backstage: Improper input validation in cloud storage URL readers (CVE-2026-106494)
Description
CVE-2026-106494 is a medium severity vulnerability in the @backstage/backend-defaults package where improper input validation in cloud storage URL readers allows an attacker with write access to a cloud storage bucket to craft object names that collide with protected files in the output directory, potentially leading to content injection. This issue is patched in version 0.17.8.
CVSS v3.1
Score 4.4medium
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in @backstage/backend-defaults involves improper input validation of cloud storage object names. An attacker who has write permissions to the cloud storage bucket used by Backstage can create object names that collide with protected files in the output directory. Under certain deployment configurations, this collision can result in content injection, compromising the integrity of the output. The flaw is identified as CWE-22 (Path Traversal) and CWE-73 (External Control of File Name or Path). The issue is fixed in version 0.17.8 of the package.
Potential Impact
An attacker with write access to the cloud storage bucket can inject content by exploiting object name collisions with protected files in the output directory. This can lead to integrity issues in the deployed content. There is no impact on confidentiality or availability reported. The CVSS v3.1 score is 4.4 (medium), reflecting the need for high privileges (write access) and high attack complexity.
Mitigation Recommendations
Upgrade @backstage/backend-defaults to version 0.17.8 or later, where the vulnerability is patched. No additional mitigation is required if the upgrade is applied.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-7649-wm97-w3j3
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-106494"]
- Ecosystems
- ["npm"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
Threat ID: 6ac6c0012cdf04f6568291b9
Added to database: 10/07/2026, 21:56:17 UTC
Last enriched: 10/07/2026, 22:15:09 UTC
Last updated: 10/07/2026, 22:15:09 UTC
Views: 7
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