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Security audit

Convex

Security checks for vulnerabilities and agentic risk

Overview

Convex changes require approval, but setup runs unverified downloads and does not disclose the CLI’s automatic changes to agent skills.

Review and approve CLI installation separately. Verify the downloaded release and consider setting OO_SKILLS_SYNC_DISABLED=1 before running oo to prevent automatic skill synchronization, as documented in its [environment settings](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md#environment-variables). Connect only the Convex permissions needed and retain mutation approvals. The installer and hosted connector code remain unverified.

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 (5)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command installs software from an Oomol endpoint and shows no Convex data operations or demonstrated connection to the declared purpose. Executing this unrelated remote installer is a materially different capability, not an established supporting implementation detail. The downloaded script's further behavior cannot be determined from the supplied chunk.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
88% confidence
Finding

The only supplied behavior is authentication through oo; nothing identifies Convex as the target or implements the declared data operations. Authentication could be a supporting implementation detail if linked to Convex, but no such connection is present in this chunk.

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 third-party code with the invoking user's permissions, without a separate integrity check or review step. Compromise of the distribution endpoint or installer could expose local secrets or alter the environment; HTTPS and a legitimate setup purpose do not eliminate this supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 77)May include surrounding context.

The setup fallback executes downloaded installation scripts without warning that third-party code will run locally and modify the system.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The missing-CLI fallback directs installation through immediate execution of downloaded shell or PowerShell code without explaining the local execution or obtaining explicit installation approval. Authorization to operate Convex does not necessarily authorize modifying the local environment; the failure-triggered setup limits exposure but does not supply that consent.

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 98)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