Backstage is an open framework for building developer portals. Prior to 0.27.1, the experimental OIDC provider in @backstage/plugin-auth-backend is vulnerable to a redirect URI allowlist bypass. Instances that have enabled experimental Dynamic Client Registration or Client ID Metadata Documents and configured allowedRedirectUriPatterns are affected. A specially crafted redirect URI can pass the allowlist validation while resolving to an attacker-controlled host. If a victim approves the resulting OAuth consent request, their authorization code is sent to the attacker, who can exchange it for a valid access token. This requires victim interaction and that one of the experimental features is explicitly enabled, which is not the default. This vulnerability is fixed in 0.27.1.
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Thu, 12 Mar 2026 21:15:00 +0000
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Thu, 12 Mar 2026 19:00:00 +0000
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| Description | Backstage is an open framework for building developer portals. Prior to 0.27.1, the experimental OIDC provider in @backstage/plugin-auth-backend is vulnerable to a redirect URI allowlist bypass. Instances that have enabled experimental Dynamic Client Registration or Client ID Metadata Documents and configured allowedRedirectUriPatterns are affected. A specially crafted redirect URI can pass the allowlist validation while resolving to an attacker-controlled host. If a victim approves the resulting OAuth consent request, their authorization code is sent to the attacker, who can exchange it for a valid access token. This requires victim interaction and that one of the experimental features is explicitly enabled, which is not the default. This vulnerability is fixed in 0.27.1. | |
| Title | @backstage/plugin-auth-backend: OAuth redirect URI allowlist bypass | |
| Weaknesses | CWE-601 | |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-03-12T20:46:46.618Z
Reserved: 2026-03-11T14:47:05.683Z
Link: CVE-2026-32235
Updated: 2026-03-12T20:38:14.902Z
Status : Awaiting Analysis
Published: 2026-03-12T19:16:17.443
Modified: 2026-03-12T21:07:53.427
Link: CVE-2026-32235
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OpenCVE Enrichment
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