Trust Assessment
ms365 received a trust score of 10/100, placing it in the Untrusted category. This skill has significant security findings that require attention before use in production.
SkillShield's automated analysis identified 7 findings: 2 critical, 4 high, 1 medium, and 0 low severity. Key findings include Arbitrary command execution, Missing required field: name, Dangerous call: subprocess.run().
The analysis covered 4 layers: Manifest Analysis, Static Code Analysis, Dependency Graph, LLM Behavioral Safety. The Manifest Analysis layer scored lowest at 40/100, indicating areas for improvement.
Last analyzed on February 14, 2026 (commit 13146e6a). SkillShield performs automated 4-layer security analysis on AI skills and MCP servers.
Layer Breakdown
Behavioral Risk Signals
Security Findings7
| Severity | Finding | Layer | Location | |
|---|---|---|---|---|
| CRITICAL | Arbitrary command execution Python shell execution (os.system, subprocess) Review all shell execution calls. Ensure commands are static (not built from user input), use absolute paths, and are strictly necessary. Prefer library APIs over shell commands. | Manifest | skills/cvsloane/ms365/ms365_cli.py:40 | |
| CRITICAL | Arbitrary command execution Python shell execution (os.system, subprocess) Review all shell execution calls. Ensure commands are static (not built from user input), use absolute paths, and are strictly necessary. Prefer library APIs over shell commands. | Manifest | skills/cvsloane/ms365/ms365_cli.py:82 | |
| HIGH | Dangerous call: subprocess.run() Call to 'subprocess.run()' detected in function 'cmd_login'. This can execute arbitrary code. Avoid using dangerous functions like exec/eval/os.system. Use safer alternatives. | Static | skills/cvsloane/ms365/ms365_cli.py:82 | |
| HIGH | Dangerous call: subprocess.run() Call to 'subprocess.run()' detected in function 'call_mcp'. This can execute arbitrary code. Avoid using dangerous functions like exec/eval/os.system. Use safer alternatives. | Static | skills/cvsloane/ms365/ms365_cli.py:40 | |
| HIGH | Unpinned external dependency via npx -y The `ms365_cli.py` script executes an external Node.js package `@softeria/ms-365-mcp-server` using `npx -y`. The `-y` flag automatically confirms installation, and the lack of a version specifier means `npx` will always fetch and execute the *latest* available version. This introduces a significant supply chain risk, as a malicious update to the `@softeria/ms-365-mcp-server` package (or any of its dependencies) could lead to arbitrary code execution, data exfiltration, or credential harvesting on the host system. Pin the version of the `@softeria/ms-365-mcp-server` package to a known good version (e.g., `npx @softeria/ms-365-mcp-server@1.2.3`). Consider vendoring the dependency or using a package manager with lock files to ensure deterministic builds and execution. Regularly audit the pinned version for vulnerabilities. | LLM | ms365_cli.py:25 | |
| HIGH | Elevated risk of data exfiltration and credential harvesting due to unpinned dependency The skill interacts with highly sensitive Microsoft 365 data (emails, calendar, files, contacts) and uses environment variables (`MS365_MCP_CLIENT_ID`, `MS365_MCP_CLIENT_SECRET`) for authentication. The execution of an unpinned external dependency (`@softeria/ms-365-mcp-server` via `npx -y`) means that a compromise of this third-party package could directly lead to unauthorized access, exfiltration of user data, or harvesting of authentication credentials. The broad permissions required for MS365 access amplify the potential impact of such a compromise. Mitigate the primary supply chain risk by pinning the version of `@softeria/ms-365-mcp-server`. Additionally, review the required OAuth scopes for the MS365 application to ensure the principle of least privilege is applied, minimizing the data accessible even if the dependency were compromised. | LLM | ms365_cli.py:25 | |
| MEDIUM | Missing required field: name The 'name' field is required for claude_code skills but is missing from frontmatter. Add a 'name' field to the SKILL.md frontmatter. | Static | skills/cvsloane/ms365/SKILL.md:1 |
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