CVE-2026-106488 · GHSA-826h-28h9-65hg
Backstage: Improper authentication in the OIDC provider
- Risk score
- 58/100
- CVSS
- 8.1 v3.1
- Exploit chance (30 days)
- 0.3%
- Published
- 6 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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…
- Affected
- @backstage/plugin-auth-backend-module-oidc-provider (npm) < 0.4.20
- Fix
- Upgrade @backstage/plugin-auth-backend-module-oidc-provider to 0.4.20 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 8.1 high
- On your watchlist: npm
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| @backstage/plugin-auth-backend-module-oidc-provider | npm | < 0.4.20 | 0.4.20 |
References
- https://github.com/advisories/GHSA-826h-28h9-65hg
- 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/releases/tag/v1.54.6
- https://github.com/advisories/GHSA-826h-28h9-65hg
Original description
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.
Last activity 6 Oct 2026. Patch Forecast updates every hour.