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Security audit

Excel Xlsx 1

Security checks for vulnerabilities and agentic risk

Overview

This skill is a spreadsheet-handling guide with no hidden code, persistence, credential use, or unrelated system access.

This skill is reasonable to install for spreadsheet work. It may cause an agent to edit workbook files when you ask it to, so keep backups of important financial or business spreadsheets and review formula-heavy changes before relying on them.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (1)

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
75% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 89)May include surrounding context.

md
- Dynamic array or newer Excel functions like `FILTER`, `XLOOKUP`, `SORT`, or `SEQUENCE` may fail or degrade in older viewers.
- A workbook can look fine while still carrying stale cached values from a prior recalculation.
- Saving the wrong workbook view can replace formulas with cached values and quietly destroy a live model.
- Copying formulas without checking relative references can push one bad range across an entire block.
- Hidden sheets, named ranges, validations, and merged areas often keep business logic that is invisible in a quick skim.
- A workbook can appear numerically correct while still failing because filters, conditional formats, print settings, or data validation were stripped.
- A workbook can be numerically correct and still fail visually because wrapped text, clipped labels, or narrow columns were never reviewed.

Static analysis

No suspicious patterns detected.