Backstage: Improper validation of MkDocs theme configuration in TechDocs

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-106509
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 22:17:06 UTC
Updated2026-10-06 22:17:06 UTC
DescriptionBackstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs theme configuration in techdocs. When TechDocs is configured to build documentation locally or in a container, a user with write access to a registered repository can include configuration values in mkdocs.yml that cause arbitrary code execution during the documentation build process. This issue is fixed in versions 1.14.6 and 1.15.4.

Risk And Classification

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

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

Problem Types: CWE-94 | CWE-1336 | CWE-94 CWE-94: Improper Control of Generation of Code ('Code Injection') | CWE-1336 CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine

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

CVSS v3.1 Breakdown

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

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

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/commit/02cd7cdbb18b687446277b5602adaee7f1... [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.50.5 [email protected] github.com
github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a99... [email protected] github.com
github.com/backstage/backstage/security/advisories/GHSA-8w7q-29mw-gf5c [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.54.6 [email protected] github.com
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