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Security audit

Svix

Security checks for vulnerabilities and agentic risk

Overview

The Svix workflow is coherent, but missing-tool setup executes remote code without a separate approval or integrity check.

Review setup before enabling this skill. Install a verified CLI release yourself, inspect its agent-skill synchronization settings, and connect only the Svix account you intend to use. OOMOL mediates requests and credentials. All bundled content was inspected, but the remote installers and deployed 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
  • 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 installs software from Oomol, while the description presents a skill for managing Svix data. Nothing in the supplied chunk establishes this installation as a supporting dependency for Svix. The downloaded script is not provided, so its further behavior cannot be assessed.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The command pipes a mutable remote script directly into Bash without an independent integrity check or review; the PowerShell alternative uses the same download-and-execute pattern. A compromised distribution endpoint or malicious installer update could execute arbitrary code with the agent's local permissions, potentially accessing files and credentials. The documented vendor domain and conditional setup reduce suspicion of malicious intent but do not eliminate this supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 70)May include surrounding context.

Fallback setup executes downloaded installation scripts without warning about remote code execution or local system changes.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The fallback directs the agent to install software by executing downloaded code without explaining the local changes or obtaining explicit installation approval. Although restricted to first-time setup, this expands a Svix task into local code execution; the confirmation requirements for Svix writes do not explicitly cover 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 91)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