Backstage: Bypass of MkDocs configuration sanitizer in TechDocs backend

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-106505
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 22:17:05 UTC
Updated2026-10-06 22:17:05 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 is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to commit changes to a repository that uses TechDocs can circumvent the MkDocs configuration file sanitizer introduced in response to CVE-2026-25153 and execute arbitrary code on the TechDocs backend host during documentation generation. 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-426 | CWE-436 | CWE-426 CWE-426: Untrusted Search Path | CWE-436 CWE-436: Interpretation Conflict

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/security/advisories/GHSA-p75x-jh7p-ppcx [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.50.5 [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.54.6 [email protected] github.com
github.com/backstage/backstage/commit/ef92d3d2b76046205c580e7152956514c1... [email protected] github.com
github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b0698... [email protected] github.com
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