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Security audit

NiftyImages

Security checks for vulnerabilities and agentic risk

Overview

The NiftyImages features fit their purpose, but automatic installation runs unverified downloaded code and may add other skills to your agent.

Review dependency setup before installing. Prefer inspecting and installing a fixed CLI version yourself, and disable automatic skill synchronization if you want only this integration. Connecting NiftyImages authorizes OOMOL to mediate account access. The remote installers could not be inspected, and the hosted connector implementation was not supplied; this review does not establish their complete behavior.

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
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • 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
Findings (6)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command performs a remote installer execution rather than searching or reading NiftyImages data. Nothing in the chunk establishes that installing the Oomol CLI is a supporting implementation detail for the declared purpose. The downloaded script's additional behavior cannot be determined from this snippet.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
84% confidence
Finding

Authentication could support a NiftyImages workflow, but the supplied chunk consists entirely of a login command and establishes no connection to NiftyImages. Its demonstrated primary behavior therefore differs from the declared search-and-read purpose.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping the HTTPS response directly into Bash executes whatever code the installer endpoint returns, without a pinned version or independently verified integrity. A compromised distribution endpoint could therefore execute arbitrary commands with the agent's local permissions; the PowerShell equivalent has the same weakness, although both paths are conditional on the CLI being absent.

Content

Scanner excerpt · SKILL.md (reported line 63)May include surrounding context.

The fallback installation instructions execute downloaded scripts without warning about running remote code or modifying the local system.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

A missing CLI causes the instructions to escalate a read-oriented task into executing a remote installer and modifying the local environment without explicit approval. Although conditional dependency setup is legitimate, the lack of a clear warning and consent checkpoint leaves the user unaware of the expanded execution scope; this overlaps with SC2.

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 84)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

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 89)May include surrounding context.

md
## Resources

- NiftyImages homepage: https://niftyimages.com/
- API documentation: https://api.niftyimages.com/