GCVE-110-OSM-2026-764

Advisory PublishedCVSS 9.6/10

Vulnetix · Advisory published March 27, 2026

Malicious Tessa web core framework library. Supply chain attack targeting web infrastructure for Tessa 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.Web.Core	all (affected)	—

References

vendor

Malicious nuget package: Tessa.Web.Core

advisory

Explore Further

Investigate this vulnerability in the interactive console or download the raw GCVE record.

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