Backstage is an open framework for building developer portals. Prior to 0.4.20, the @backstage/plugin-auth-backend-module-oidc-provider package is affected by improper authentication in the oidc provider. 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. This issue is fixed in version 0.4.20.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/backstage/backstage/commit/1b1f05e82161aaabc226c1d7d498d746956bf942 Patch
- https://github.com/backstage/backstage/releases/tag/v1.54.6 Patch, Release Notes
- https://github.com/backstage/backstage/security/advisories/GHSA-826h-28h9-65hg Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.1 · linuxfoundationNVD modified 2026-10-22 14:44
Affected (CPE criteria) 2
cpe:2.3:a:linuxfoundation:backstage\/plugin-auth-backend-module-oidc-provider:*:*:*:*:*:node.js:*:*cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*