Improper Verification of Cryptographic Signature Affecting @backstage/plugin-auth-backend-module-oidc-provider package, versions <0.4.20
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-BACKSTAGEPLUGINAUTHBACKENDMODULEOIDCPROVIDER-20826429
- published11 Oct 2026
- disclosed7 Oct 2026
- creditdjamaile
Introduced: 7 Oct 2026
NewCVE-2026-106488 (opens in a new tab)How to fix?
Upgrade @backstage/plugin-auth-backend-module-oidc-provider to version 0.4.20 or higher.
Overview
@backstage/plugin-auth-backend-module-oidc-provider is a The oidc-provider backend module for the auth plugin.
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature in the oidcAuthenticator within authenticator.ts, where the email claim from the OIDC userinfo endpoint is accepted into the user profile without verifying the email_verified flag. An attacker who controls an OIDC identity provider, or whose provider does not enforce email verification, can supply an unverified email address that gets trusted as a validated identity claim, potentially allowing account takeover or privilege escalation by impersonating another user's email address.