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EUVD-2026-200325

2026-10-07T11:54:42.450744+00:00

EUVD-2026-200325

fkie_cve-2024-51987

2026-10-07T11:54:42.450780+00:00

Duende.AccessTokenManagement.OpenIdConnect is a set of .NET libraries that manage OAuth and OpenId Connect access tokens. HTTP Clients created by `AddUserAccessTokenHttpClient` may use a different user's access token after a token refresh occurs. This occurs because a refreshed token will be captured in pooled `HttpClient` instances, which may be used by a different user. Instead of using `AddUserAccessTokenHttpClient` to create an `HttpClient` that automatically adds a managed token to outgoing requests, you can use the `HttpConext.GetUserAccessTokenAsync` extension method or the `IUserTokenManagementService.GetAccessTokenAsync` method. This issue is fixed in Duende.AccessTokenManagement.OpenIdConnect 3.0.1. All users are advised to upgrade. There are no known workarounds for this vulnerability.

GHSA-7mr7-4f54-vcx5 — HTTP Client uses incorrect token after refresh

2026-10-07T11:54:42.450816+00:00

Affected: NuGet: Duende.AccessTokenManagement.OpenIdConnect

### Impact HTTP Clients created by `AddUserAccessTokenHttpClient` may use a different user's access token after a token refresh. This occurs because a refreshed token will be captured in pooled `HttpClient` instances, which may be used by a different user.

### Workarounds Instead of using `AddUserAccessTokenHttpClient` to create an `HttpClient` that automatically adds a managed token to outgoing requests, you can use the `HttpConext.GetUserAccessTokenAsync` extension method or the `IUserTokenManagementService.GetAccessTokenAsync` method.

### Patches This issue is fixed in Duende.AccessTokenManagement.OpenIdConnect 3.0.1.