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EUVD-2026-243700

2026-10-06T04:43:54.082878+00:00

EUVD-2026-243700

fkie_cve-2024-21643

2026-10-06T04:43:54.082909+00:00

IdentityModel Extensions for .NET provide assemblies for web developers that wish to use federated identity providers for establishing the caller's identity. Anyone leveraging the `SignedHttpRequest`protocol or the `SignedHttpRequestValidator`is vulnerable. Microsoft.IdentityModel trusts the `jku`claim by default for the `SignedHttpRequest`protocol. This raises the possibility to make any remote or local `HTTP GET` request. The vulnerability has been fixed in Microsoft.IdentityModel.Protocols.SignedHttpRequest. Users should update all their Microsoft.IdentityModel versions to 7.1.2 (for 7x) or higher, 6.34.0 (for 6x) or higher.

GHSA-rv9j-c866-gp5h — Microsoft.IdentityModel.Protocols.SignedHttpRequest remote code execution vulnerability

2026-10-06T04:43:54.082943+00:00

Affected: NuGet: Microsoft.IdentityModel.Protocols.SignedHttpRequest

### Impact _What kind of vulnerability is it? Who is impacted?_ Anyone leveraging the `SignedHttpRequest`protocol or the `SignedHttpRequestValidator`is vulnerable. Microsoft.IdentityModel trusts the `jku`claim by default for the `SignedHttpRequest`protocol. This raises the possibility to make any remote or local `HTTP GET` request.

### Patches _Has the problem been patched? What versions should users upgrade to?_ The vulnerability has been fixed in Microsoft.IdentityModel.Protocols.SignedHttpRequest. Users **should** update **all** their Microsoft.IdentityModel versions to 7.1.2 (for 7x) or higher, 6.34.0 (for 6x) or higher, if using Microsoft.IdentityModel.Protocols.SignedHttpRequest.

### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_ No, users must upgrade.

### References _Are there any links users can visit to find out more?_ https://aka.ms/IdentityModel/Jan2024/jku

gsd-2024-21643

2026-10-06T04:43:54.082977+00:00

gsd-2024-21643