CVE-2024-21643 json
Microsoft.IdentityModel.Protocols.SignedHttpRequest remote code execution vulnerability
published 2024-01-09 2 y ago modified 2026-09-10 1 mo ago also GHSA-rv9j-c866-gp5h , EUVD-2024-0423
- cvss
- 7.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.2%
- EPSS 2.2% chance of exploitation in 30 days, percentile 82%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- nuget Microsoft.IdentityModel.Protocols.SignedHttpRequest 6.34.0, 7.1.2
- microsoft identitymodel_extensions 6.34.0, 7.1.2
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 16 mo ago
Exploit prediction
2.23% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 7.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| nuget | Microsoft.IdentityModel.Protocols.SignedHttpRequest | <6.34.0 >=7.0.0-preview, <7.1.2 |
6.34.0 7.1.2 |
Affected products
- AzureAD azure-activedirectory-identitymodel-extensions-for-dotnet
Classification
- Weakness
-
- CWE-94 Improper Control of Generation of Code
References
-
github.com
/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/security/advisories/GHSA-rv9j-c866-gp5h
web, vendor-advisory
-
github.com
/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/releases/tag/6.34.0
web, release-notes
-
github.com
/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/releases/tag/7.1.2
web, release-notes
-
github.com
/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/wiki/jkucve
web, mitigation, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2024-21643
advisory
-
github.com
/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet
package
Sources
- CVE List CVE-2024-21643
- GitHub Advisory GHSA-rv9j-c866-gp5h
- NVD CVE-2024-21643
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