CVE-2026-29186

HIGH

7.7

Description

Backstage is an open framework for building developer portals. Prior to version 1.14.3, this is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process. A gap in this allowlist allows attackers to craft an mkdocs.yml that causes arbitrary Python code execution, completely bypassing TechDocs' security controls. This issue has been patched in version 1.14.3.

CVE Details

CVSS v3.1 Score7.7

SeverityHIGH

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

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredLOW

User InteractionNONE

Published3/7/2026

Last Modified3/11/2026

Sourcenvd

Honeypot Sightings0

Affected Products

linuxfoundation:backstage_plugin-techdocs-node

Weaknesses (CWE)

CWE-74CWE-434CWE-434

References

https://github.com/backstage/backstage/security/advisories/GHSA-928r-fm4v-mvrw(security-advisories@github.com)

IOC Correlations

No correlations recorded

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