Backstage prior 1.14.8/1.15.6/2.0.1 TechDocs code injection

Summaryinfo

A vulnerability labeled as critical has been found in Backstage. This issue affects some unknown processing of the component TechDocs. Executing a manipulation can lead to code injection. This vulnerability is tracked as CVE-2026-106558. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in Backstage and classified as critical. This vulnerability affects an unknown part of the component TechDocs. The manipulation with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Backstage is an open framework for building developer portals. Prior to 1.14.8, 1.15.6, and 2.0.1, the @backstage/plugin-techdocs-node package improperly validated mapping-style markdown_extensions configuration. An authenticated attacker who can register or influence an SCM-backed documentation source may bypass TechDocs sanitization and cause Python objects to be imported and instantiated in the generator runtime, leading to arbitrary code execution. Earlier fixes in versions 1.14.6 and 1.15.4 did not fully address the supported mapping representation of markdown_extensions. Impact is greatest when documentation generation runs with backend credentials, filesystem access, or internal network access. This issue is fixed in versions 1.14.8, 1.15.6, and 2.0.1.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-106558 since 10/06/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.

Upgrading to version 1.14.8, 1.15.6 or 2.0.1 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

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• Backstage

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

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