Path Traversal in @Backstage Plugin-Techdocs-Node
CVE-2026-106557
Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package did not sufficiently validate TechDocs Markdown extension configuration. An authenticated user who can register or modify documentation sources may cause a TechDocs build to access resources outside the intended documentation boundary, potentially exposing backend-host data or internal network resources. This issue is fixed in versions 1.14.6 and 1.15.4 when pymdown-extensions 10.21.3 or later is also used, normally through mkdocs-techdocs-core 1.7.0 or later.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
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-f7v3-xhm6-w245
- github.com/backstage/backstage/commit/017ace52d9b327ededc6704cf17799c875ae0f29
- github.com/backstage/backstage/commit/2d9de4ca117a529de4b6ed7dfb7aa507ca7b3f91
- github.com/backstage/backstage/releases/tag/v1.50.5
- github.com/backstage/backstage/releases/tag/v1.54.6
Frequently asked questions
- What is CVE-2026-106557?
- CVE-2026-106557 is a high-severity vulnerability in @Backstage Plugin-Techdocs-Node, classified under Path Traversal. CVSS score: 7.7/10. Published 2026-10-07.
- How severe is CVE-2026-106557?
- High severity. CVSS v3 base score is 7.7 out of 10.