CVE-2026-106488

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.

CVSS 3.1

8.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 20% of CVEs (scores of 2026-10-25)

CWE

CWE-287

Published

2026-10-06

Modified

2026-10-22

Record from

the NVD, synced 2026-10-22

Affected

• linuxfoundation:backstage
• linuxfoundation:backstage\/plugin-auth-backend-module-oidc-provider

Packages (OSV)

References

• https://github.com/backstage/backstage/commit/1b1f05e82161aaabc226c1d7d498d746956bf942
• https://github.com/backstage/backstage/releases/tag/v1.54.6
• https://github.com/backstage/backstage/security/advisories/GHSA-826h-28h9-65hg

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