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Security audit

Langsearch

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed LangSearch API integration that sends search queries and the LangSearch API key only to the documented LangSearch API endpoint.

Install only if you are comfortable sending your search queries, reranking documents, and LangSearch API key to LangSearch over HTTPS. Keep the API key in an environment variable and avoid using the skill for confidential queries unless LangSearch's data handling terms meet your needs.

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
  • Taint TrackingDirect Taint Flow, Variable-Mediated Taint Flow, Credential Exfiltration Chain
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (27)

Tainted flow: 'headers' from os.getenv (line 47, credential/environment) → requests.post (network output)

Critical
Category
Data Flow
Confidence
90% confidence
Finding

Credentials or environment variables flow to a network sink. This is a high-confidence indicator of credential exfiltration.

Content

Scanner excerpt · scripts/web_search_example.py (reported line 65)May include surrounding context.

python
for attempt in range(max_retries):
        try:
            response = requests.post(url, headers=headers, json=payload, timeout=30)

            if response.status_code == 200:
                return response.json()

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
94% confidence
Finding

The skill performs network requests and uses an environment credential, but it does not declare an explicit tool scope such as permissions or allowed-tools. This creates a policy and review gap: an agent may be able to invoke broader capabilities than the skill contract clearly communicates, increasing the chance of unintended credential use or outbound requests.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 71)May include surrounding context.

md
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 126)May include surrounding context.

md
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 150)May include surrounding context.

md
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 179)May include surrounding context.

md
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 194)May include surrounding context.

md
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 214)May include surrounding context.

md
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload

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 · SKILL.md (reported line 71)May include surrounding context.

md
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload

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 · SKILL.md (reported line 126)May include surrounding context.

md
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload

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 · SKILL.md (reported line 150)May include surrounding context.

md
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload

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 · SKILL.md (reported line 179)May include surrounding context.

md
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload

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 · SKILL.md (reported line 214)May include surrounding context.

md
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 84)May include surrounding context.

Or using cURL:

bash
curl -X POST https://api.langsearch.com/v1/web-search \
  -H "Authorization: Bearer $LANGSEARCH_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{

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 · SKILL.md (reported line 194)May include surrounding context.

md
]

# Rerank for better relevance
rerank_response = requests.post(
    "https://api.langsearch.com/v1/rerank",
    headers=headers,
    json={

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 16)May include surrounding context.

md
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 72)May include surrounding context.

md
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 84)May include surrounding context.

md
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 99)May include surrounding context.

md
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 127)May include surrounding context.

md
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 151)May include surrounding context.

md
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 163)May include surrounding context.

md
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 180)May include surrounding context.

md
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 195)May include surrounding context.

md
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% 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 · SKILL.md (reported line 215)May include surrounding context.

md
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:

Static analysis

No suspicious patterns detected.