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Security audit

fxTwitter

Security checks for vulnerabilities and agentic risk

Overview

This skill is a narrow, disclosed helper for fetching public X/Twitter post data through fxTwitter.

Install only if you are comfortable sending requested X/Twitter post IDs to the third-party fxTwitter API. Avoid using it for private or sensitive links, and expect the returned data to include public tweet metadata such as author, media, and engagement stats.

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
  • 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)

Lp3

Medium
Category
MCP Least Privilege
Confidence
86% confidence
Finding
The skill performs network access to a third-party API but does not declare any explicit tool scope or permissions boundary. That increases the chance of unintended external requests or overly broad runtime access, reducing reviewability and making it harder to enforce least privilege.

External Transmission

Medium
Category
Data Exfiltration
Content
return None

def fetch_tweet(tweet_id):
    url = f"https://api.fxtwitter.com/{tweet_id}"
    req = urllib.request.Request(url, headers={"User-Agent": "fxtwitter-skill/1.0"})
    with urllib.request.urlopen(req) as resp:
        return json.loads(resp.read())
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
return None

def fetch_tweet(tweet_id):
    url = f"https://api.fxtwitter.com/{tweet_id}"
    req = urllib.request.Request(url, headers={"User-Agent": "fxtwitter-skill/1.0"})
    with urllib.request.urlopen(req) as resp:
        return json.loads(resp.read())
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
return None

def fetch_tweet(tweet_id):
    url = f"https://api.fxtwitter.com/{tweet_id}"
    req = urllib.request.Request(url, headers={"User-Agent": "fxtwitter-skill/1.0"})
    with urllib.request.urlopen(req) as resp:
        return json.loads(resp.read())
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.