.NET CVE-2026-102869

Exploitation requires user interaction (CVSS UI:R): a victim must open, load, or build an attacker-supplied malicious file, project, or package within .NET tooling or Visual Studio so the type-confusion code path is reached. No authentication is required (PR:N, unauthenticated attacker), but the practical limiting factor is the need to socially engineer a developer into processing untrusted content - there is no evidence of a zero-click or service-side trigger. Affected versions were not enumerated in the input, so defenders should confirm exact build/version prerequisites against the MSRC advisory.

This is a credible high-priority issue but with important caveats. The input CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, base 8.8) describes a network-reachable, low-complexity, unauthenticated flaw with full C/I/A impact - but the mandatory UI:R means a victim must actively interact (open/process an attacker-supplied file or project), which materially lowers real-world exploitability versus a true zero-click remote flaw. No EPSS score was supplied, so statistical exploitation probability cannot be weighed. The vulnerability is NOT in CISA KEV and no POC was provided, so exploitation status is 'no public exploit identified at time of analysis' - there is no evidence of active or automatable exploitation. SSVC inputs (exploitation, automatable, technical impact) were not provided; based only on the vector, technical impact is high but automatable is likely 'no' given the required user interaction. CONFLICT TO NOTE: the description frames this as privilege elevation ('elevate privileges over a network') while the CVSS encodes full C/I/A loss and UI:R, which reads more like code execution via a malicious file in a developer context - verify the precise impact and whether 'network' really means remote delivery of a crafted file versus true remote service exploitation with the Microsoft advisory. Overall: patch promptly in developer/build environments, but this is user-interaction-gated, not a wormable remote threat.

An attacker crafts a malicious .NET file, project, or package and uses social engineering to get a developer to open or build it in Visual Studio or process it with the .NET tooling. The crafted input triggers a type-confusion condition (CWE-843) in which a resource is accessed as an incompatible type, corrupting memory and allowing the attacker to run code and elevate privileges in the victim's context. No public exploit code was identified at the time of analysis.