Backstage: Improper input validation in TechDocs static content requests

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-106490
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 21:17:17 UTC
Updated2026-10-06 21:17:17 UTC
DescriptionBackstage 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Problem Types: CWE-22 | CWE-23 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | CWE-23 CWE-23: Relative Path Traversal

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Backstage Backstage affected < 1.54.6 Not specified
CNA @backstage Plugin-techdocs-backend affected < 2.2.4 Not specified

References

ReferenceSourceLinkTags
github.com/backstage/backstage/commit/40ecc4c2e88b0218125b0a3405d1f6315b... [email protected] github.com
github.com/backstage/backstage/security/advisories/GHSA-7mfx-xg57-53c9 [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.54.6 [email protected] github.com
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