High severityNVD Advisory· Published Dec 9, 2025· Updated Dec 9, 2025
CSLA .NET is vulnerable to Remote Code Execution via WcfProxy
CVE-2025-66631
Description
CSLA .NET is a framework designed for the development of reusable, object-oriented business layers for applications. Versions 5.5.4 and below allow the use of WcfProxy. WcfProxy uses the now-obsolete NetDataContractSerializer (NDCS) and is vulnerable to remote code execution during deserialization. This vulnerability is fixed in version 6.0.0. To workaround this issue, remove the WcfProxy in data portal configurations.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
CslaNuGet | < 6.0.0 | 6.0.0 |
Affected products
2- Range: < 6.0.0
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-wq34-7f4g-953vghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-66631ghsaADVISORY
- github.com/MarimerLLC/csla/issues/4001ghsax_refsource_MISCWEB
- github.com/MarimerLLC/csla/pull/4018ghsax_refsource_MISCWEB
- github.com/MarimerLLC/csla/security/advisories/GHSA-wq34-7f4g-953vghsax_refsource_CONFIRMWEB
- learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca2310ghsaWEB
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