Is CVE-2026-45555 actively exploited?

No active exploitation of CVE-2026-45555 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-45555 be exploited remotely?

No. CVE-2026-45555 requires local access to exploit.

What is the CVSS score of CVE-2026-45555?

CVE-2026-45555 has a CVSS score of 7.8 (HIGH).

HOME VULNERABILITIESCVE-2026-45555

HIGH

CVE-2026-45555

CWE-94Published: May 29, 2026· Updated: Jun 1, 2026

7.8

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:6.9th

Official Description

Roslyn CodeLens MCP Server is a Roslyn-based MCP server providing semantic code intelligence for .NET codebases. From 0.0.9 to 1.17.0, the get_diagnostics MCP tool loads and executes all DiagnosticAnalyzer assemblies referenced by the target solution without any allowlist, signature check, or user confirmation; includeAnalyzers defaults to true, so no explicit opt-in is required. An attacker who can place a malicious .csproj referencing an attacker-controlled DLL in a location the victim opens with the MCP server will achieve arbitrary code execution in the server process with the server's OS privileges. This vulnerability is fixed in 1.17.0.

NVD Source

Technical Analysis

CVE-2026-45555 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.