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Security audit

Aicoo Group Chat

Security checks for vulnerabilities and agentic risk

Overview

This group-chat skill is mostly coherent, but it gives agents broad messaging and group-management powers without enough scoping or confirmation guidance.

Review before installing. Use it only if you want an agent to operate authenticated Aicoo group chats, and require explicit confirmation before sending messages, searching outside group conversations, creating invite links, changing settings, inviting or removing members, or using contacts/network data to find people.

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 Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (14)

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
93% confidence
Finding

The trigger list includes broad phrases such as 'join group', 'team chat', and 'group conversation', which may match ordinary discussion and cause unintended invocation of a skill that performs real messaging and membership actions. Because the skill can create groups, invite members, and generate links, over-broad activation raises the risk of accidental external actions.

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 25)May include surrounding context.

Send to group via unified message route

bash
curl -s -X POST "https://www.aicoo.io/api/v1/agent/message" \
  -H "Authorization: Bearer $AICOO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{

Description-Behavior Mismatch

Medium
Category
Not specified by scanner
Confidence
91% confidence
Finding

The skill is presented as a group-chat helper, but it documents view=all and cross-conversation search that can enumerate and search messages outside group contexts. That scope expansion increases the chance an agent will access unrelated direct or shared-agent conversations without an explicit user request, creating an over-privileged data access path.

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 173)May include surrounding context.

Create Group

bash
curl -s -X POST "https://www.aicoo.io/api/groups" \
  -H "Cookie: better-auth.session_token=<SESSION>" \
  -H "Content-Type: application/json" \
  -d '{

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 210)May include surrounding context.

Update Group (admin only)

bash
curl -s -X PATCH "https://www.aicoo.io/api/groups/1" \
  -H "Cookie: better-auth.session_token=<SESSION>" \
  -H "Content-Type: application/json" \
  -d '{

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 224)May include surrounding context.

Send Message

bash
curl -s -X POST "https://www.aicoo.io/api/groups/1/messages" \
  -H "Cookie: better-auth.session_token=<SESSION>" \
  -H "Content-Type: application/json" \
  -d '{

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 303)May include surrounding context.

Invite Members (admin only)

bash
curl -s -X POST "https://www.aicoo.io/api/groups/1/invites" \
  -H "Cookie: better-auth.session_token=<SESSION>" \
  -H "Content-Type: application/json" \
  -d '{

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 326)May include surrounding context.

bash
# Accept
curl -s -X POST "https://www.aicoo.io/api/groups/invites/42" \
  -H "Cookie: better-auth.session_token=<SESSION>" \
  -H "Content-Type: application/json" \
  -d '{ "action": "accept" }' | jq .

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 332)May include surrounding context.

bash
# Accept
curl -s -X POST "https://www.aicoo.io/api/groups/invites/42" \
  -H "Cookie: better-auth.session_token=<SESSION>" \
  -H "Content-Type: application/json" \
  -d '{ "action": "accept" }' | jq .

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
91% confidence
Finding

The skill documents generation of a public join link without warning that possession of the token may allow anyone to join the group. In a messaging context, that can expose private conversations to unintended parties if the link is shared, logged, or pasted into the wrong channel.

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 354)May include surrounding context.

Join via Link

bash
curl -s -X POST "https://www.aicoo.io/api/groups/join-link" \
  -H "Cookie: better-auth.session_token=<SESSION>" \
  -H "Content-Type: application/json" \
  -d '{ "token": "abc123..." }' | jq .

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 370)May include surrounding context.

md
-H "Cookie: better-auth.session_token=<SESSION>" | jq .

# Update settings (admin only)
curl -s -X PATCH "https://www.aicoo.io/api/groups/1/settings" \
  -H "Cookie: better-auth.session_token=<SESSION>" \
  -H "Content-Type: application/json" \
  -d '{

Context-Inappropriate Capability

Medium
Category
Not specified by scanner
Confidence
86% confidence
Finding

The practical guidance tells the agent to find user IDs from contacts or network, which broadens the skill from group management into discovery of people and identifiers. In context, this can enable unsolicited enumeration of users and assembling groups without clear user authorization for accessing contacts/network data.

Content

No source excerpt is available for this finding.

Missing User Warnings

Low
Category
Not specified by scanner
Confidence
79% confidence
Finding

The documentation treats member removal and leaving a group as routine actions without warning that they change membership and may transfer ownership or revoke access. This increases the chance of accidental administrative changes in a multi-party communication setting.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.