RCE in @Backstage Plugin-Techdocs-Node
CVE-2026-106556
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.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- @Backstage Plugin-Techdocs-Node — versions < 1.14.6, >= 1.15.0, < 1.15.4
- Backstage — versions < 1.50.5, >= 1.51.0-next.0, < 1.54.6
Weakness classification (CWE)
References
- github.com/backstage/backstage/security/advisories/GHSA-g2hj-v2j6-vfvg
- github.com/backstage/backstage/commit/25125ee727a3de3418a8fa6a9e458cd5b73ecf26
- github.com/backstage/backstage/commit/b6d1aea0bef99b8dfec3c8746032474867ba677a
- github.com/backstage/backstage/releases/tag/v1.50.5
- github.com/backstage/backstage/releases/tag/v1.54.6
Frequently asked questions
- What is CVE-2026-106556?
- CVE-2026-106556 is a high-severity vulnerability in @Backstage Plugin-Techdocs-Node, classified under OS Command Injection. CVSS score: 7.7/10. Published 2026-10-07.
- How severe is CVE-2026-106556?
- High severity. CVSS v3 base score is 7.7 out of 10.