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Security audit

Jwtdecode

Security checks for vulnerabilities and agentic risk

Overview

This skill is a low-risk static reference script, but its JWT decode content is generic and likely not very useful.

Before installing, understand that this appears safe from a security perspective but may disappoint users expecting real JWT decoding reference material; review it mainly for usefulness and accuracy rather than for sensitive-access risk.

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
Vulnerability Patterns
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (3)

Credential Access

High
Category
Privilege Escalation
Confidence
70% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · scripts/script.sh (reported line 64)May include surrounding context.

sh
## Prerequisites
- Basic understanding of devtools concepts
- Required tools and access credentials
- System meeting minimum requirements

## Installation

Intent-Code Divergence

Medium
Category
Not specified by scanner
Confidence
93% confidence
Finding

The top-of-file comment explicitly states this is a Jwtdecode reference tool for devtools contexts. The implementation contradicts that claim by serving generic sections on installation, migration, security, and debugging without jwtdecode-specific commands, APIs, formats, or usage details, creating an intent-versus-code/documentation divergence.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

Medium
Category
Not specified by scanner
Confidence
96% confidence
Finding

The manifest promises a reference tool for Jwtdecode concepts, best practices, and implementation patterns. However, every command prints broad, templated devtools guidance with generic phrases like 'specialized tool/concept in the devtools domain' rather than any jwtdecode-specific reference material, so the implemented behavior does not substantively match the claimed subject matter.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.