What is CVE-2026-106490?

CVE-2026-106490 is a medium-severity vulnerability in Backstage, classified under Path Traversal. CVSS score: 6.5/10. Published 2026-10-06.

How severe is CVE-2026-106490?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Path Traversal in Backstage

CVE-2026-106490

Backstage is an open framework for building developer portals. Prior to 2.2.4, the @backstage/plugin-techdocs-backend package is affected by improper input validation in techdocs static content requests. When using the Azure Blob Storage provider, an authenticated Backstage user may be able to read restricted TechDocs content when entity-level permissions are enabled. Deployments that intentionally disable the default backend authentication policy may have broader exposure. This issue is fixed in version 2.2.4.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2026-10-06 · last modified 2026-10-07.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/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 — versions < 1.54.6

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-106490?: CVE-2026-106490 is a medium-severity vulnerability in Backstage, classified under Path Traversal. CVSS score: 6.5/10. Published 2026-10-06.
How severe is CVE-2026-106490?: Medium severity. CVSS v3 base score is 6.5 out of 10.