GCVE-110-OSM-2026-767

Advisory PublishedCVSS 9.6/10

Vulnetix · Advisory published March 27, 2026

Malicious Tessa server library for .NET. Supply chain attack targeting Tessa server deployments with MSBuild-based code execution. Exploits NuGet's MSBuild integration by placing malicious code in .targets files as inline tasks. When projects build, MSBuild automatically imports and executes these tasks, downloading .NET executables from throwaway GitHub repositories with embedded obfuscated command-line payloads.

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Weaknesses (CWE)

CWE-506Embedded Malicious Code

Risk Scores

CVSS 3.1

9.6/10

Critical · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected Products

Vendor	Product	Versions	Platforms
unknown	Tessa.Server.Net	all (affected)	—

References

Malicious nuget package: Tessa.Server.Net

advisory

vendor

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