Back to skill

Security audit

WebinarJam

Security checks for vulnerabilities and agentic risk

Overview

The WebinarJam workflow is coherent, but its automatic setup runs unchecked remote installers without clear approval or disclosure of broader agent changes.

Review the setup before installing. Use a reviewed, fixed CLI version, control its bundled-skill synchronization, and confirm which WebinarJam account and registrant data OOMOL may access. Keep the required confirmation for registrations. The remote installers and hosted connector were not verified; the review concern is uncontrolled setup behavior, not evidence of malicious intent.

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
  • 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
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (4)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
98% confidence
Finding

The supplied code performs remote installer execution rather than any visible WebinarJam operation. Nothing in the chunk establishes this installation as a supporting dependency for WebinarJam. The downloaded script's contents are not provided, so its further behavior cannot be determined.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a remotely fetched script directly into Bash executes mutable external code without integrity verification or a review opportunity; the PowerShell alternative has the same weakness. A compromised distribution endpoint could execute arbitrary code with the agent's local privileges, although the missing-CLI condition limits when this path is reached and an enforced oo-only tool allowlist could block it.

Content

Scanner excerpt · SKILL.md (reported line 58)May include surrounding context.

The fallback setup instructs the agent to execute 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 after a missing-command error without first disclosing local system changes or obtaining installation approval. Although prerequisite setup is legitimate and conditional, a request to operate WebinarJam does not necessarily authorize executing an installer with the agent's local privileges.

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 79)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