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GHSA-826h-28h9-65hg

Backstage: Improper authentication in the OIDC provider

Source: GitHub Advisory Database (reviewed) High CVE-2026-106488

Packages

EcosystemPackageAffectedFixed in
npm @backstage/plugin-auth-backend-module-oidc-provider < 0.4.20 0.4.20

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact Deployments using OIDC email-based identity resolution with a provider that permits unverified email addresses may allow an authenticated provider user to assume another catalog identity. This may grant access and permissions associated with that user. No direct availability impact is demonstrated. ### Patches Patched in `@backstage/plugin-auth-backend-module-oidc-provider` version `0.4.20`. ### Workarounds - Disable email-based sign-in resolution for the OIDC provider, or require the identity provider to verify email addresses before allowing sign-in.

References

External links from the advisory. They lead to third-party sites.