CVE-2026-29186
EUVD-2026-1014607.03.2026, 15:15
Backstage is an open framework for building developer portals. Prior to version 1.14.3, this is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process. A gap in this allowlist allows attackers to craft an mkdocs.yml that causes arbitrary Python code execution, completely bypassing TechDocs' security controls. This issue has been patched in version 1.14.3.
Affected Products (NVD)
| Vendor | Product | Version |
|---|---|---|
| linuxfoundation | backstage_plugin-techdocs-node | 𝑥 < 1.14.3 |
𝑥
= Vulnerable software versions
Common Weakness Enumeration
- CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')The software constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.
- CWE-434 - Unrestricted Upload of File with Dangerous TypeThe software allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment.