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Security audit

Tinyfish Agent Run

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed TinyFish API wrapper that sends a user-provided URL and goal to TinyFish and streams the result back.

Install only if you are comfortable sending the target URL, automation goal, and resulting browsing activity to TinyFish under your TinyFish account. Do not use it with secret-bearing URLs, internal systems, regulated data, or confidential prompts unless that external sharing is approved.

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
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (4)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
94% confidence
Finding

The skill invokes shell commands and an external script but does not declare any tool scope or allowed-tools boundary. That omission weakens least-privilege controls, making it easier for an agent or caller to execute the shell-capable skill in environments where the shell access is broader than intended.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
96% confidence
Finding

The skill instructs users to send a URL and goal to a third-party TinyFish service, but it does not clearly warn that these inputs will leave the local environment. This can cause unintentional disclosure of sensitive URLs, internal targets, credentials embedded in URLs, or confidential task instructions to an external provider.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
70% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · scripts/agent-run.sh (reported line 33)May include surrounding context.

sh
# Each SSE frame starts with "data: ". Strip that prefix, drop blank lines and
# keepalive comments, and print the JSON payload one-per-line so callers can
# consume events as they stream in.
curl -sN -X POST "https://agent.tinyfish.ai/v1/automation/run-sse" \
  -H "X-API-Key: ${TINYFISH_API_KEY}" \
  -H "Content-Type: application/json" \
  -H "Accept: text/event-stream" \

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
87% confidence
Finding

This code performs a network POST to an external endpoint and sends potentially sensitive user or system data (url, goal) along with an API credential in the request headers. While the behavior is inferable from the code, there is no user-facing disclosure at the point of execution such as a prompt, visible notice, or warning comment directed at users about transmitting data to a remote service.

Content

No source excerpt is available for this finding.