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Security audit

LinkedIn Inbox Manager — Smart LinkedIn Inbox from Linxa

Security checks for vulnerabilities and agentic risk

Overview

The skill is a disclosed LinkedIn inbox helper that uses a Linxa bearer token to read and manage conversations, with some scope wording users should notice.

Install only if you are comfortable letting Linxa and your agent access LinkedIn-derived inbox data through LINXA_TOKEN. Review the Chrome extension and Linxa account permissions, revoke the token when no longer needed, and confirm before allowing comment creation or marking conversations as read.

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
  • 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
  • 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 · openapi.yaml (reported line 21)May include surrounding context.

yaml
**Prerequisites**:
    1. Install the Linxa Chrome Extension
    2. Sign in at https://app.uselinxa.com/ with your LinkedIn account
    3. Generate an access token at https://app.uselinxa.com/setup-mcp
    4. Set: export LINXA_TOKEN=YOUR_TOKEN

    **Authentication**:

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The skill explicitly says to trigger whenever the user mentions Linxa, which is broader than the skill’s stated functional scope of LinkedIn inbox and lead-management tasks. This can cause unintended invocation in unrelated conversations, increasing the chance of unnecessary access to LinkedIn-derived data or user confusion about why this skill was activated.

Content

No source excerpt is available for this finding.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
94% confidence
Finding

The instruction to 'always use this skill for any LinkedIn messaging or LinkedIn lead management task' is overly absolute and can override normal intent disambiguation. In practice, that can route loosely related requests into a tool that can read messages, fetch threads, add comments, and mark conversations as read, creating unnecessary exposure and the possibility of unintended state-changing actions.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.