Relative Path Traversal 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-2026-106490 (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 Relative Path Traversal via the /static/docs/:namespace/:kind/:name route handler in router.ts, where the isPathWithinEntity function fails to account for backslash-encoded traversal sequences when validating the requested content path. An authenticated attacker can craft a request containing backslash characters to escape the intended entity directory and read TechDocs content belonging to other entities, bypassing entity-level permission checks.
Note: This is only exploitable when using the Azure Blob Storage provider and when entity-level permissions are enabled.