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CVE-2024-21643

Microsoft.IdentityModel.Protocols.SignedHttpRequest remote code execution vulnerability

HIGH
8.8
CVSS Score
Published: January 10, 2024 at 04:13 AM UTC
Updated: June 17, 2026 at 07:09 AM UTC
2 products affected across 2 vendorsIdentitymodel ExtensionsIdentitymodel Extensions

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Severity
HIGH8.8
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Identitymodel Extensions· Microsoftnuget
95%
v < 6.34.07.0.0 ≤ v < 7.1.2
Affected range stops below 6.34.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.1.2, so it looks safe — our inference, not a vendor statement
Identitymodel Extensions· Azuread
60%
v < 6.34.0v < 7.1.2
Affected range stops below 6.34.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.1.2, so it looks safe — our inference, not a vendor statement

References (4)

x_refsource_MISCRelease Notes
Source: [email protected]
https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/releases/tag/6.34.0
x_refsource_MISCRelease Notes
Source: [email protected]
https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/releases/tag/7.1.2
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/security/advisories/GHSA-rv9j-c866-gp5h
x_refsource_MISCMitigationThird Party Advisory
Source: [email protected]
https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/wiki/jkucve

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-94

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