CVE-2026-32235
CVE-2026-32235 · @backstage/plugin-auth-backend: OAuth redirect URI allowlist bypass
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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.
CVSS 5.9 · Mittel · EPSS 0,1% · Korrektur verfügbar
- Veröffentlicht
- Aktualisiert
Technologie-Stack: node
Betroffene Produkte und Versionen
plugin-auth-backend
- Softwareversionen
- < 0.27.1: Betroffen
Keine Korrektur veröffentlicht
@backstage/plugin-auth-backend npm
- Betroffene Versionsbereiche
- SEMVER: < 0.27.1
Auf 0.27.1 aktualisieren