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Security audit

You.com Web Search & Research CLI

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward You.com web search helper, with expected external API use and no hidden persistence or destructive behavior.

Install this only if you want an agent to use You.com for web search, research, and URL content extraction. Treat all queries, prompts, and URLs as being sent to a third-party service, and avoid secrets, credentials, internal-only links, regulated data, or confidential client details unless that use 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
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (15)

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The mandatory triggers are broad enough to cause the skill to activate for generic research, crawling, or web-fetch tasks even when the user may not intend to send data to You.com services. Overbroad invocation increases the chance of unnecessary external transmission of user queries or URLs to third-party endpoints.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The skill explains setup and API usage but does not prominently warn users that their search terms, URLs, and fetched page contents are transmitted to external You.com infrastructure. This can lead to unintended disclosure of sensitive prompts, internal URLs, or proprietary content during normal use.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% 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 44)May include surrounding context.

md
| Command | Method | URL | Auth |
|---------|--------|-----|------|
| Search | GET | `https://api.you.com/v1/agents/search` | Optional (free tier) |
| Research | POST | `https://api.you.com/v1/research` | Required |
| Contents | POST | `https://ydc-index.io/v1/contents` | Required |

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% 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 45)May include surrounding context.

md
| Command | Method | URL | Auth |
|---------|--------|-----|------|
| Search | GET | `https://api.you.com/v1/agents/search` | Optional (free tier) |
| Research | POST | `https://api.you.com/v1/research` | Required |
| Contents | POST | `https://ydc-index.io/v1/contents` | Required |

External Transmission

Medium
Category
Data Exfiltration
Confidence
90% confidence
Finding

The basic search example sends the user's query to an external search service, which is an intended capability but still a genuine data-exposure path. Without a prominent warning, users may submit sensitive search terms assuming local processing.

Content

Scanner excerpt · SKILL.md (reported line 99)May include surrounding context.

Search

bash
# Basic search (works without API key)
curl -s "https://api.you.com/v1/agents/search?query=AI+news" \
  ${YDC_API_KEY:+-H "X-API-Key: $YDC_API_KEY"} | jq '.results.web[] | {title,url,description}'

# With filters

External Transmission

Medium
Category
Data Exfiltration
Confidence
90% confidence
Finding

The filtered search example still transmits query data and possibly location-like metadata such as country preferences to an external service. The contextual filters do not reduce the core privacy risk of off-platform request handling.

Content

Scanner excerpt · SKILL.md (reported line 103)May include surrounding context.

md
${YDC_API_KEY:+-H "X-API-Key: $YDC_API_KEY"} | jq '.results.web[] | {title,url,description}'

# With filters
curl -s "https://api.you.com/v1/agents/search?query=news&freshness=week&country=US" \
  ${YDC_API_KEY:+-H "X-API-Key: $YDC_API_KEY"}

# Search with livecrawl — full page content (untrusted)

External Transmission

Medium
Category
Data Exfiltration
Confidence
94% confidence
Finding

The livecrawl example is more dangerous than basic search because it not only sends the query externally but also retrieves and passes full page content back into the agent context. Even though the skill labels this content untrusted and wraps it, it still increases exposure to prompt injection and accidental handling of sensitive page data.

Content

Scanner excerpt · SKILL.md (reported line 107)May include surrounding context.

${YDC_API_KEY:+-H "X-API-Key: $YDC_API_KEY"}

Search with livecrawl — full page content (untrusted)

CONTENT=$(curl -s "https://api.you.com/v1/agents/search?query=docs&livecrawl=web&livecrawl_formats=markdown"
${YDC_API_KEY:+-H "X-API-Key: $YDC_API_KEY"} | jq -r '.results.web[0].contents.markdown') echo "$CONTENT"

text

External Transmission

Medium
Category
Data Exfiltration
Confidence
91% confidence
Finding

This example sends user-supplied URLs to the external contents endpoint, which necessarily discloses those URLs and may cause third-party fetching of potentially sensitive locations. In an agent setting, that can expose internal references or confidential research targets if no consent or validation step exists.

Content

Scanner excerpt · SKILL.md (reported line 115)May include surrounding context.

Contents

bash
# Extract from URL (requires API key)
CONTENT=$(curl -s -X POST "https://ydc-index.io/v1/contents" \
  -H "X-API-Key: $YDC_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"urls":["https://example.com"],"formats":["markdown"]}' | jq -r '.[0].markdown')

External Transmission

Medium
Category
Data Exfiltration
Confidence
91% confidence
Finding

The multi-URL contents example expands the same risk by transmitting several URLs at once to an external service, increasing the amount of potentially sensitive metadata disclosed. Bulk submission also raises the chance that an agent forwards internal or private links without adequate review.

Content

Scanner excerpt · SKILL.md (reported line 122)May include surrounding context.

md
echo "<external-content>$CONTENT</external-content>"

# Multiple URLs
CONTENT=$(curl -s -X POST "https://ydc-index.io/v1/contents" \
  -H "X-API-Key: $YDC_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"urls":["https://a.com","https://b.com"],"formats":["markdown"]}' | jq -r '.[].markdown')

External Transmission

Medium
Category
Data Exfiltration
Confidence
93% confidence
Finding

This line represents an actual external API submission of user research text and therefore a real egress vector, not merely documentation. In context, the skill is meant for web research, which makes the behavior expected, but the absence of stronger upfront disclosure keeps it security-relevant.

Content

Scanner excerpt · SKILL.md (reported line 132)May include surrounding context.

Research

bash
# Research with citations (requires API key)
CONTENT=$(curl -s -X POST "https://api.you.com/v1/research" \
  -H "X-API-Key: $YDC_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"input":"latest AI developments"}' | jq -r '.output.content')

External Transmission

Medium
Category
Data Exfiltration
Confidence
93% confidence
Finding

This line represents an actual external API submission of user research text and therefore a real egress vector, not merely documentation. In context, the skill is meant for web research, which makes the behavior expected, but the absence of stronger upfront disclosure keeps it security-relevant.

Content

Scanner excerpt · SKILL.md (reported line 132)May include surrounding context.

Research

bash
# Research with citations (requires API key)
CONTENT=$(curl -s -X POST "https://api.you.com/v1/research" \
  -H "X-API-Key: $YDC_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"input":"latest AI developments"}' | jq -r '.output.content')

External Transmission

Medium
Category
Data Exfiltration
Confidence
93% confidence
Finding

This deep-effort research submission is a true data-transmission issue because it sends externally supplied prompt material to a third party for processing. The skill context lowers suspicion of malice because this is core functionality, but it remains dangerous if users include confidential internal details.

Content

Scanner excerpt · SKILL.md (reported line 139)May include surrounding context.

md
echo "<external-content>$CONTENT</external-content>"

# Research with citations (deep effort)
CONTENT=$(curl -s -X POST "https://api.you.com/v1/research" \
  -H "X-API-Key: $YDC_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"input":"quantum computing breakthroughs","research_effort":"deep"}' | jq -r '.output.content')

External Transmission

Medium
Category
Data Exfiltration
Confidence
93% confidence
Finding

This deep-effort research submission is a true data-transmission issue because it sends externally supplied prompt material to a third party for processing. The skill context lowers suspicion of malice because this is core functionality, but it remains dangerous if users include confidential internal details.

Content

Scanner excerpt · SKILL.md (reported line 139)May include surrounding context.

md
echo "<external-content>$CONTENT</external-content>"

# Research with citations (deep effort)
CONTENT=$(curl -s -X POST "https://api.you.com/v1/research" \
  -H "X-API-Key: $YDC_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"input":"quantum computing breakthroughs","research_effort":"deep"}' | jq -r '.output.content')

External Transmission

Medium
Category
Data Exfiltration
Confidence
92% confidence
Finding

Although the output is source metadata, the request still transmits the input topic to the remote research endpoint. This can reveal sensitive investigative interests, client names, or internal initiatives to the provider.

Content

Scanner excerpt · SKILL.md (reported line 146)May include surrounding context.

md
echo "<external-content>$CONTENT</external-content>"

# Extract cited sources
SOURCES=$(curl -s -X POST "https://api.you.com/v1/research" \
  -H "X-API-Key: $YDC_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"input":"AI news"}' | jq -r '.output.sources[] | "\(.title): \(.url)"')

External Transmission

Medium
Category
Data Exfiltration
Confidence
92% confidence
Finding

Although the output is source metadata, the request still transmits the input topic to the remote research endpoint. This can reveal sensitive investigative interests, client names, or internal initiatives to the provider.

Content

Scanner excerpt · SKILL.md (reported line 146)May include surrounding context.

md
echo "<external-content>$CONTENT</external-content>"

# Extract cited sources
SOURCES=$(curl -s -X POST "https://api.you.com/v1/research" \
  -H "X-API-Key: $YDC_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"input":"AI news"}' | jq -r '.output.sources[] | "\(.title): \(.url)"')

Static analysis

No suspicious patterns detected.