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Security audit

Flagsmith

Security checks for vulnerabilities and agentic risk

Overview

The Flagsmith workflow is coherent, but its automatic setup runs unverified remote code without clearly controlling lasting changes to the host.

Review the setup before use. Install a reviewed CLI version yourself and disable unwanted automatic skill synchronization. Connect only the intended Flagsmith environment, understanding that OOMOL processes requests and holds connector credentials. Preserve the required confirmations for writes. The remote installer and server-side connector implementation were unavailable for inspection; the Review verdict concerns setup control and disclosure, without 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 command installs or runs remote Oomol tooling rather than reading or modifying Flagsmith data. Nothing in the supplied chunk establishes this as a supporting dependency for Flagsmith. The downloaded script is not provided, so its additional effects cannot be determined; the observable mismatch is the unrelated remote installation and execution.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
97% confidence
Finding

The command pipes a mutable remote script directly into Bash without integrity verification or an opportunity to review the downloaded artifact; the PowerShell alternative has the same issue. Compromise of the installation endpoint or release infrastructure could execute attacker-controlled code with the invoking user's privileges, although the documented vendor endpoint and conditional setup provide no evidence of deliberate malicious intent.

Content

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

Fallback setup executes remote installation scripts without warning about local system changes.

Medium
Category
Output Handling
Confidence
92% confidence
Finding

The fallback directs the agent to install software when the CLI is missing, without requiring approval for local changes or explaining their scope. Approval to operate Flagsmith does not necessarily authorize running an installer on the host, although restricting this behavior to a missing-command error reduces its exposure.

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