GitHub Advisoryadvisory · npm

GHSA-826h-28h9-65hg Backstage: Improper authentication in the OIDC provider

HIGH Published 2026-10-07 Modified 2026-10-07 Official page ↗
Aliases
CVE-2026-106488
Ecosystem
npm
Packages
@backstage/plugin-auth-backend-module-oidc-provider
Severity
High
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weaknesses
CWE-287
Reviewed
2026-10-07

Affected packages

• npm @backstage/plugin-auth-backend-module-oidc-provider: < 0.4.20 → fixed in 0.4.20

Description

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.

Related

Alias · CVE (1)

  • CVE-2026-106488 Backstage is an open framework for building developer portals. vulnerability

Weakness · CWE (1)

  • CWE-287 Improper Authentication weakness

References