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Security audit

Webex

Security checks for vulnerabilities and agentic risk

Overview

The Webex workflow has clear safeguards, but its setup fallback can execute unverified downloaded code without a separate approval step.

Review this skill's setup before enabling it. Install a verified CLI release separately, check its automatic skill-installation settings, and approve local changes explicitly. Consider whether OOMOL should handle your Webex data, and retain the stated confirmations for writes and deletions. The bundled instructions were fully inspected, but the external installers and connector implementation remain unverified; no malicious intent was established.

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 command executes code from an Oomol CLI installation endpoint rather than performing Webex operations. Nothing in the supplied chunk establishes this installer as a supporting dependency for Webex. The downloaded script is 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

The command pipes remotely fetched content directly into Bash without version pinning or independent integrity verification; the PowerShell alternative has the same trust issue. HTTPS and the apparently relevant vendor domain reduce some risks, but a compromised distribution endpoint could still execute arbitrary code with the agent's privileges and expose local files or credentials.

Content

Scanner excerpt · SKILL.md (reported line 94)May include surrounding context.

The setup workflow executes a downloaded installer without warning about local system changes or requesting approval.

Medium
Category
Output Handling
Confidence
91% confidence
Finding

The fallback instructs the agent to install software when the CLI is missing without requiring approval for local system changes. Although conditional setup is relevant to this skill, a Webex request does not inherently authorize executing installer code 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 115)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