CVE-2026-106489CWE-22CWE-862path-traversalbroken-access-control

CVE-2026-106489

Medium · published October 7, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
20.2
In the wild
Unconfirmed
What it is

Backstage is an open framework for building developer portals. Prior to 2.2.4, the @backstage/plugin-techdocs-backend package is affected by improper authorization enforcement for techdocs static content. An authenticated user with access to one TechDocs documentation site could craft a URL able to read documentation belonging to a different entity. This only affects deployments using the external TechDocs builder with an external storage provider (S3, GCS, etc.) and the permission framework enabled. Instances that do not use the permission framework are unaffected, since TechDocs content is visible to all authenticated users by design. This issue is fixed in version 2.2.4.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00287 · 20.2th percentile
Weaknesses
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'); CWE-862 · Missing Authorization
Published
2026-10-07T01:17Z
Affected products (2)
ProductVersionsFixed in
linuxfoundation/backstage\/plugin-techdocs-backend< 2.2.42.2.4
linuxfoundation/backstage< 1.54.61.54.6
References (3)
https://github.com/backstage/backstage/commit/bf6bbf7326ada7d96d7b2c4ebc4a71546106f311 · [email protected]https://github.com/backstage/backstage/releases/tag/v1.54.6 · [email protected]https://github.com/backstage/backstage/security/advisories/GHSA-rg9r-hr7g-5gc2 · [email protected]
EPSS history
Timeline
  • 08 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 06 OCT 20:39Z
    Backstage: Improper authorization enforcement for TechDocs static content
    cvelistv5