Open Redirect
CVE-2026-32235
MEDIUM
GHSA-wqvh-63mv-9w92
Severity by source
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
AnalysisAI
Medium severity vulnerability in See description. #
Technical ContextAI
Vulnerability Type: Improper Input Validation (CWE-20) CVSS 3.1: 5.9/10.0 — Attack Vector: Network | Complexity: High | Privileges Required: None | User Interaction: Required Attack Techniques: Authentication Bypass Source: https://github.com/backstage/backstage Authentication bypass allows attackers to access protected resources without valid credentials.
Affected ProductsAI
Product: See description
RemediationAI
Patches available:
- https://github.com/backstage/backstage/commit/6042dd0c7f0706e0f473dafa92799ecf19c825ec
Upgrade to @backstage/plugin-auth-backend version 0.27.1 or later. Workaround: s
Disable experimental Dynamic Client Registration and Client ID Metadata Documents features if they are not required. Security advisories:
- https://github.com/backstage/backstage/security/advisories/GHSA-wqvh-63mv-9w92
Update to the latest patched version as soon as possible.
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