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Security audit

Xodo Sign

Security checks for vulnerabilities and agentic risk

Overview

The skill is mostly coherent for managing Xodo Sign through OOMOL, but its setup guidance asks users to execute unverified remote installer scripts.

Review the installer source and prefer a verified, pinned, or package-manager installation path for the oo CLI before installing. Use the skill only with the intended OOMOL-connected Xodo Sign account, and require explicit confirmation before creating documents, sending reminders, or reassigning signers.

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
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (2)

External Script Fetching

High
Category
Supply Chain
Confidence
97% confidence
Finding

The skill recommends installing software via curl ... | bash, which executes remote script content directly without integrity verification, review, or pinning. If the install endpoint, transport path, or upstream distribution is compromised, an operator following the instructions could execute attacker-controlled code on their machine.

Content

Scanner excerpt · SKILL.md (reported line 63)May include surrounding context.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
96% confidence
Finding

The description says to use this skill for "ANY Xodo Sign request" and "Whenever a task involves Xodo Sign," which is extremely broad and lacks boundaries or exclusion conditions. This can cause unintended invocation for casual mentions or loosely related tasks involving Xodo Sign rather than a clearly scoped set of actions.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.