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Security audit

ExhibitDay

Security checks for vulnerabilities and agentic risk

Overview

The ExhibitDay workflow is appropriately scoped, but its setup can execute unverified downloaded code without a separate approval step.

Review and install a verified CLI release yourself before enabling automatic setup, including its behavior for installing other agent skills. OOMOL intermediates ExhibitDay requests and manages the connected credential. Keep the required confirmations for changes and deletions. The remote installers and hosted connector implementation were not verified.

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
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Output HandlingUnvalidated Output Injection, Cross-Context Output, Unbounded Output
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
Findings (5)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
97% confidence
Finding

The supplied command performs remote installer execution, not ExhibitDay data management. Nothing in the supplied chunk establishes that this installer is a supporting dependency for ExhibitDay, so its behavior is materially outside the declared purpose. The downloaded script's contents and downstream effects are not visible and cannot be determined from this chunk.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
99% confidence
Finding

The command pipes a remotely fetched, unpinned script directly into Bash without verifying its integrity or reviewing it; the PowerShell alternative has the same weakness. If the distribution endpoint or delivery infrastructure is compromised, attacker-controlled code could run with the invoking user's permissions, potentially exposing local secrets or modifying files; HTTPS and the conditional setup trigger do not eliminate that risk.

Content

Scanner excerpt · SKILL.md (reported line 64)May include surrounding context.

The setup workflow executes remotely downloaded installation scripts without warning about local system changes.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The fallback directs the agent to install software without requiring approval or explaining that installation executes code and can change the local environment. Limiting this to a missing CLI reduces exposure, but the skill's confirmation requirements for ExhibitDay writes do not explicitly cover local installation.

Content

No source excerpt is available for this finding.

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
80% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 85)May include surrounding context.

md
- **`OOMOL_INSUFFICIENT_CREDIT`** — OOMOL billing stop. Recharge at `https://console.oomol.com/billing/token-recharge` before retrying.

- **HTTP 402 without `OOMOL_INSUFFICIENT_CREDIT`** — the third-party account itself has no active plan or credit. Report the provider error message as is; do not ask the user to recharge OOMOL.

## Resources

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 90)May include surrounding context.

md
## Resources

- ExhibitDay homepage: https://www.exhibitday.com
- API documentation: https://api.exhibitday.com/