CVE-2026-106508

MEDIUM 5.3

Backstage: Potential file exposure through local TechDocs publisher

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

Backstage is an open framework for building developer portals. Prior to 1.15.4, the @backstage/plugin-techdocs-node package is affected by potential file exposure through local techdocs publisher. When using the local TechDocs publisher (techdocs.publisher.type: 'local'), it was possible for the documentation serving endpoint to follow filesystem references outside the intended documentation tree, potentially exposing host files to authenticated users. This is mitigated by the fact that exploration requires preconditions that do not arise through normal MkDocs operation. Cloud-based publishers (S3, GCS, Azure Blob Storage) are not affected. This issue is fixed in version 1.15.4.

CWE	CWE-22 CWE-59
Vendor	backstage
Product	backstage
Published	Oct 6, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

backstage / backstage

< 1.54.6

@backstage / plugin-techdocs-node

< 1.15.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/backstage/backstage/security/advisories/GHSA-cm77-ch27-6w6v github.com: https://github.com/backstage/backstage/commit/6aecb26f337ffec1d4e67ce903cf1e39b6082ec4 github.com: https://github.com/backstage/backstage/releases/tag/v1.54.6