CVE-2026-106509
High
Description
Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs theme configuration in techdocs. When TechDocs is configured to build documentation locally or in a container, a user with write access to a registered repository can include configuration values in mkdocs.yml that cause arbitrary code execution during the documentation build process. This issue is fixed in versions 1.14.6 and 1.15.4.
SeverityHigh
CVSS7.7
Exploit probability—
Product
Linuxfoundation Backstage Plugin-techdocs-node
PublishedOct 6, 2026
First seenOct 6, 2026
Weakness typeCWE-94Code injectionCWE-1336CWE-1336
How to fix
Update
- linuxfoundation backstage_plugin-techdocs-node1.14.6, 1.15.4 or later
- linuxfoundation backstage1.50.5, 1.54.6 or later
- @backstage/plugin-techdocs-node1.15.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linuxfoundation backstage_plugin-techdocs-node | v < 1.14.6, 1.15.0 ≤ v < 1.15.4 | 1.14.6, 1.15.4 |
| linuxfoundation backstage | v < 1.50.5, 1.51.1 ≤ v < 1.54.6, 1.51.0 | 1.50.5, 1.54.6 |
| @backstage/plugin-techdocs-nodenpm | v < 1.15.4 | 1.15.4 |
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