Open Redirect Affecting @backstage/plugin-auth-backend package, versions <0.27.1
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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Test your applications- Snyk IDSNYK-JS-BACKSTAGEPLUGINAUTHBACKEND-15479718
- published12 Mar 2026
- disclosed12 Mar 2026
- creditUnknown
Introduced: 12 Mar 2026
NewCVE-2026-32235 (opens in a new tab)How to fix?
Upgrade @backstage/plugin-auth-backend to version 0.27.1 or higher.
Overview
@backstage/plugin-auth-backend is an A Backstage backend plugin that handles authentication
Affected versions of this package are vulnerable to Open Redirect via the OAuth redirect URI validation bypass. An attacker can intercept authorization codes by crafting a redirect URI that bypasses the allowlist and leads to an attacker-controlled host, provided a victim approves the OAuth consent request. This is only exploitable if experimental Dynamic Client Registration or Client ID Metadata Documents features are explicitly enabled.
Note:
This issue affects experimental Dynamic Client Registration and Client ID Metadata Documents features with configured allowedRedirectUriPatterns.