Backstage: Improper authentication in the OIDC provider
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.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @backstage/plugin-auth-backend-module-oidc-provider | < 0.4.20 | 0.4.20 |
References
- https://github.com/backstage/backstage/security/advisories/GHSA-826h-28h9-65hg
- https://nvd.nist.gov/vuln/detail/CVE-2026-106488
- https://github.com/backstage/backstage/commit/1b1f05e82161aaabc226c1d7d498d746956bf942
- https://github.com/backstage/backstage
- https://github.com/backstage/backstage/releases/tag/v1.54.6
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N- Weakness (CWE)
CWE-287- Platform
- npm
- Package
@backstage/plugin-auth-backend-module-oidc-provider- Disclosed
- 07.10.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-826h-28h9-65hg - CC BY 4.0
Vulnerability history: @backstage/plugin-auth-backend-module-oidc-provider
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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