Backstage up to 1.20.0 SCM URL Parser path traversal

Summaryinfo

A vulnerability labeled as critical has been found in Backstage up to 1.20.0. The affected element is an unknown function of the component SCM URL Parser. The manipulation results in path traversal. This vulnerability is cataloged as CVE-2026-29185. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Backstage up to 1.20.0. It has been classified as problematic. Affected is an unknown part of the component SCM URL Parser. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality. CVE summarizes:

Backstage is an open framework for building developer portals. Prior to version 1.20.1, a vulnerability in the SCM URL parsing used by Backstage integrations allowed path traversal sequences in encoded form to be included in file paths. When these URLs were processed by integration functions that construct API URLs, the traversal segments could redirect requests to unintended SCM provider API endpoints using the configured server-side integration credentials. This issue has been patched in version 1.20.1.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-29185 since 03/04/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are needed for exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 1.20.1 eliminates this vulnerability.

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Productinfo

Name

• Backstage

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20.0

Website

• Product: https://github.com/backstage/backstage/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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