CVE-2026-126129 · Package
NO FIX YET
The Auth0 ASP.NET Core Authentication SDK wrongly decides whether a session has been ended by OIDC Back-Channel Logout. A logged-out session can therefore still be accepted for protected endpoints.
first public Nov 10, 2026 · 1 source
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Applications built on the Auth0 ASP.NET Core Authentication SDK that rely on OIDC Back-Channel Logout to end sessions are the ones at risk, since a session that should be logged out may still be accepted. Apps that do not use back-channel logout are likely not exposed, but the sources do not confirm the exact conditions.
Not affected if no-back-channel-logout
Who cares asp.net-core, auth0, nuget, oidc
Auth0.AspNetCore.Authentication) and note its version.No fix yet, per the sources.
The Auth0 ASP.NET Core Authentication SDK incorrectly determines a session's OIDC Back-Channel Logout status, which may result in a logged-out session being accepted for access to protected endpoints.
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