Backstage: Improper input validation in TechDocs Markdown extension configuration

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-106557
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-07 17:16:50 UTC
Updated2026-10-07 18:17:16 UTC
DescriptionBackstage 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.

Risk And Classification

Primary CVSS: v3.1 7.7 HIGH from [email protected]

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

Problem Types: CWE-22 | CWE-918 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Backstage Backstage affected < 1.50.5 Not specified
CNA Backstage Backstage affected >= 1.51.0-next.0, < 1.54.6 Not specified
CNA @backstage Plugin-techdocs-node affected < 1.14.6 Not specified
CNA @backstage Plugin-techdocs-node affected >= 1.15.0, < 1.15.4 Not specified

References

ReferenceSourceLinkTags
github.com/backstage/backstage/security/advisories/GHSA-f7v3-xhm6-w245 [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.50.5 [email protected] github.com
github.com/backstage/backstage/commit/2d9de4ca117a529de4b6ed7dfb7aa507ca... [email protected] github.com
github.com/backstage/backstage/commit/017ace52d9b327ededc6704cf17799c875... [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.54.6 [email protected] github.com
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