Path Traversal in @Backstage Plugin-Techdocs-Node
CVE-2026-106508
Backstage is an open framework for building developer portals. Prior to 1.15.4, the @backstage/plugin-techdocs-node package is affected by potential file exposure through local techdocs publisher. When using the local TechDocs publisher (techdocs.publisher.type: 'local'), it was possible for the documentation serving endpoint to follow filesystem references outside the intended documentation tree, potentially exposing host files to authenticated users. This is mitigated by the fact that exploration requires preconditions that do not arise through normal MkDocs operation. Cloud-based publishers (S3, GCS, Azure Blob Storage) are not affected. This issue is fixed in version 1.15.4.
Vulnerability class: Path Traversal (Directory Traversal)
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/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 < 1.15.4
- Backstage — versions < 1.54.6
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-106508?
- CVE-2026-106508 is a medium-severity vulnerability in @Backstage Plugin-Techdocs-Node, classified under Path Traversal. CVSS score: 5.3/10. Published 2026-10-06.
- How severe is CVE-2026-106508?
- Medium severity. CVSS v3 base score is 5.3 out of 10.