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CVE-2024-21643

Microsoft.IdentityModel.Protocols.SignedHttpRequest remote code execution vulnerability

7.1 HighFix available

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 SignedHttpRequestprotocol or the SignedHttpRequestValidatoris vulnerable. Microsoft.IdentityModel trusts the jkuclaim by default for the SignedHttpRequestprotocol. 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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
Low

Exploit likelihood

2.23%Up 2.2 points since Jan 18, 2024
90%50%10%1%

What each source reports

CVE List Score used 7.1

Microsoft.IdentityModel.Protocols.SignedHttpRequest remote code execution vulnerability

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 SignedHttpRequestprotocol or the SignedHttpRequestValidatoris vulnerable. Microsoft.IdentityModel trusts the jkuclaim by default for the SignedHttpRequestprotocol. 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.

Record
CVE-2024-21643
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
Weakness
CWE-94
Updated
2026-11-02
EUVDEUVD-2024-0423 7.1

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 SignedHttpRequestprotocol or the SignedHttpRequestValidatoris vulnerable. Microsoft.IdentityModel trusts the jkuclaim by default for the SignedHttpRequestprotocol. 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.

Record
EUVD-2024-0423
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-rv9j-c866-gp5h 7.1

Microsoft.IdentityModel.Protocols.SignedHttpRequest remote code execution vulnerability

Impact

What kind of vulnerability is it? Who is impacted? Anyone leveraging the SignedHttpRequestprotocol or the SignedHttpRequestValidatoris vulnerable. Microsoft.IdentityModel trusts the jkuclaim by default for the SignedHttpRequestprotocol. 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

Record
GHSA-rv9j-c866-gp5h
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
Weakness
CWE-94
Updated
2026-11-02
NVD 7.1

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 SignedHttpRequestprotocol or the SignedHttpRequestValidatoris vulnerable. Microsoft.IdentityModel trusts the jkuclaim by default for the SignedHttpRequestprotocol. 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.

Record
CVE-2024-21643
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-94
Updated
2026-11-02
OSV 7.1

Microsoft.IdentityModel.Protocols.SignedHttpRequest remote code execution vulnerability

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 SignedHttpRequestprotocol or the SignedHttpRequestValidatoris vulnerable. Microsoft.IdentityModel trusts the jkuclaim by default for the SignedHttpRequestprotocol. 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.

Record
CVE-2024-21643
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
Weakness
CWE-94
Updated
2026-11-02
OSVGHSA-rv9j-c866-gp5h 7.1

Microsoft.IdentityModel.Protocols.SignedHttpRequest remote code execution vulnerability

Impact

What kind of vulnerability is it? Who is impacted? Anyone leveraging the SignedHttpRequestprotocol or the SignedHttpRequestValidatoris vulnerable. Microsoft.IdentityModel trusts the jkuclaim by default for the SignedHttpRequestprotocol. 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

Record
GHSA-rv9j-c866-gp5h
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
Weakness
CWE-94
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
Microsoft.IdentityModel.Protocols.SignedHttpRequest
NuGet
 before 6.34.0
6.34.0
Microsoft.IdentityModel.Protocols.SignedHttpRequest
NuGet
 7.0.0-preview up to 7.1.2
7.1.2
Microsoft.IdentityModel.Protocols.SignedHttpRequest
NuGet
 before 6.34.0, plus listed versions
6.10.06.10.16.10.26.11.06.11.1
Show 44 moreShow less
6.12.06.12.16.12.26.13.06.13.16.14.06.14.16.15.06.15.16.16.06.17.06.18.06.19.06.20.06.21.06.22.06.22.16.23.06.23.16.24.06.25.06.25.16.26.06.26.16.27.06.28.06.28.16.29.06.30.06.30.16.31.06.32.06.32.16.32.26.32.36.33.06.5.06.5.16.6.06.7.06.7.16.7.2-preview-108032227156.8.06.9.0
6.34.0
Microsoft.IdentityModel.Protocols.SignedHttpRequest
NuGet
 7.0.0-preview up to 7.1.2, plus listed versions
7.0.07.0.0-preview27.0.0-preview37.0.0-preview47.0.0-preview5
Show 4 moreShow less
7.0.17.0.27.0.37.1.0-preview
7.1.2

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-21643 is a high vulnerability (CVSS 7.1) in Microsoft Identitymodel Extensions, published January 9, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.23%, the 82nd percentile. Fixed in Microsoft.IdentityModel.Protocols.SignedHttpRequest 6.34.0.

References

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