Missing Authorization Affecting @backstage/plugin-techdocs-backend package, versions <2.2.4
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published11 Oct 2026
- disclosed7 Oct 2026
- creditUnknown
Introduced: 7 Oct 2026
NewCVE-2026-106489 (opens in a new tab)How to fix?
Upgrade @backstage/plugin-techdocs-backend to version 2.2.4 or higher.
Overview
@backstage/plugin-techdocs-backend is a The Backstage backend plugin that renders technical documentation for your components
Affected versions of this package are vulnerable to Missing Authorization via the /static/docs/:namespace/:kind/:name route handler in router.ts, where an attacker can supply a path containing ../ sequences to traverse outside the intended entity directory and access content belonging to other entities in the configured external storage backend (S3, GCS, etc.). The isPathWithinEntity function introduced in the fix normalizes and validates the request path to prevent this traversal.