Back to skill

Security audit

ClickUp

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward ClickUp API helper, with disclosed credential and network use that fits its stated purpose.

Install this only if you intend agents to access your ClickUp workspace. Use the least-privileged ClickUp token available, avoid placing tokens in shared files or transcripts, and require explicit approval before creating, updating, or deleting tasks.

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
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (28)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
95% confidence
Finding

The skill clearly instructs use of shell commands and a helper script that can perform authenticated API operations, but it declares no explicit tool scope or permissions boundary. That increases the chance the agent invokes shell unnecessarily or without clear user consent, especially because the shell can also access environment variables containing ClickUp credentials.

Content

No source excerpt is available for this finding.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
94% confidence
Finding

The description is broad enough that the skill may activate for generic project-management requests, not just explicit ClickUp tasks. That can lead to unintended access to workspace data or execution of networked shell commands when the user did not clearly ask to use ClickUp.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
97% confidence
Finding

The skill includes concrete task creation and update examples against the live API without warning that these are write operations affecting production ClickUp data. In an agent setting, this raises the risk of accidental task creation, modification, or workflow disruption from ambiguous prompts or over-eager automation.

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 138)May include surrounding context.

Create a Task

bash
curl "https://api.clickup.com/api/v2/list/{list_id}/task" \
  -X POST \
  -H "Authorization: {api_key}" \
  -H "Content-Type: application/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 · references/api-guide.md (reported line 108)May include surrounding context.

Create a Task

bash
curl "https://api.clickup.com/api/v2/list/{list_id}/task" \
  -X POST \
  -H "Authorization: {api_key}" \
  -H "Content-Type: application/json" \

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
81% confidence
Finding

The quick-reference table documents a DELETE endpoint without any warning that deletion may be irreversible or require confirmation. In an automation-oriented skill, surfacing destructive capability without guardrails can lead to accidental data loss when users or agents generalize from the reference and invoke deletion unsafely.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
89% confidence
Finding

The guide documents handling of task objects that include personally identifiable information such as usernames, emails, descriptions, URLs, and due dates, but it does not warn users about minimizing collection, redacting output, or protecting tokens and exported data. In an agent skill context, examples are often copied directly into automations, so this omission increases the chance of unnecessary exposure of workplace data in logs, terminals, chat transcripts, or downstream tools.

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 49)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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 110)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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 138)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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 154)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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 172)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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 181)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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 188)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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 221)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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 · references/api-guide.md (reported line 11)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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 · references/api-guide.md (reported line 15)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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 · references/api-guide.md (reported line 28)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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 · references/api-guide.md (reported line 68)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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 · references/api-guide.md (reported line 75)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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 · references/api-guide.md (reported line 87)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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 · references/api-guide.md (reported line 94)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

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 · references/api-guide.md (reported line 101)May include surrounding context.

md
# API call helper
clickup_api() {
    local endpoint="$1"
    curl -s "https://api.clickup.com/api/v2${endpoint}" \
        -H "Authorization: ${CLICKUP_API_KEY}"
}

Static analysis

No suspicious patterns detected.