Server-side Request Forgery (SSRF) Affecting @backstage/plugin-catalog-backend package, versions <3.9.1
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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Start learning- Snyk IDSNYK-JS-BACKSTAGEPLUGINCATALOGBACKEND-20825104
- published11 Oct 2026
- disclosed7 Oct 2026
- creditUnknown
Introduced: 7 Oct 2026
NewCVE-2026-106498 (opens in a new tab)How to fix?
Upgrade @backstage/plugin-catalog-backend to version 3.9.1 or higher.
Overview
@backstage/plugin-catalog-backend is a The Backstage backend plugin that provides the Backstage catalog
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) via the relativeUrl function in PlaceholderProcessor.ts, where a catalog entity placeholder value referencing a path is resolved against a base URL without validating that the resolved URL remains within the same repository. An authenticated attacker with permission to register or modify catalog entities can supply a placeholder path that resolves to an arbitrary external repository or host, causing the backend to fetch and potentially expose the contents of files outside the intended repository.