Backstage up to 1.14.5/1.15.3 TechDocs code injection

Summaryinfo

A vulnerability described as critical has been identified in Backstage up to 1.14.5/1.15.3. The affected element is an unknown function of the component TechDocs. The manipulation results in code injection. This vulnerability is cataloged as CVE-2026-106556. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Backstage up to 1.14.5/1.15.3. It has been classified as critical. Affected is an unknown code block of the component TechDocs. The manipulation with an unknown input leads to a code injection vulnerability. CWE is classifying the issue as CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by configuration bypass in techdocs mkdocs.yml sanitization. Insufficient validation of MkDocs configuration during TechDocs generation could allow an authenticated user who can register or modify documentation sources to execute arbitrary commands in the build environment. Impact is limited to resources accessible to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-106556 since 10/06/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1059 by the MITRE ATT&CK project.

Upgrading to version 1.14.6 or 1.15.4 eliminates this vulnerability.

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Productinfo

Name

• Backstage

Version

• 1.14.0
• 1.14.1
• 1.14.2
• 1.14.3
• 1.14.4
• 1.14.5
• 1.15.0
• 1.15.1
• 1.15.2
• 1.15.3

Website

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

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