CVE-2026-106508 — Backstage is an open framework for building developer portals.
Description
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.
CVSS v3.1 base metrics
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:NMedium severity
Band computed from the CVSS base score, not the source's own label — so it means the same thing across every feed.
AV
Network
Attack Vector
AC
High
Attack Complexity
PR
Low
Privileges Required
UI
None
User Interaction
S
Unchanged
Scope
C
High
Confidentiality
I
None
Integrity
A
None
Availability
Affected
- Vendor
- npm
- Product
- @backstage/plugin-techdocs-node
Versions
- pkg:npm/%40backstage/plugin-techdocs-node < 1.15.4
Stated as the source expressed them.
References
- otherOSV webhttps://github.com/backstage/backstage/commit/6aecb26f337ffec1d4e67ce903cf1e39b6082ec4
- otherOSV webhttps://github.com/backstage/backstage/releases/tag/v1.54.6
- otherOSV webhttps://github.com/backstage/backstage/security/advisories/GHSA-cm77-ch27-6w6v
- advisoryOSV GHSA-cm77-ch27-6w6vhttps://osv.dev/vulnerability/GHSA-cm77-ch27-6w6v
- advisoryOSV advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-106508
- vendorOSV packagehttps://github.com/backstage/backstage
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