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Security audit

Pexels

Security checks for vulnerabilities and agentic risk

Overview

The Pexels features fit the stated purpose, but setup can run unverified downloaded software without clear user approval.

Review setup before installing. Install a reviewed, version-pinned CLI separately, decide whether to allow its automatic skill synchronization, and connect only the intended Pexels account through OOMOL. The external installer could not be inspected and was not executed. The evidence supports setup concerns, not a claim 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 code performs remote script execution, with no visible Pexels search or data-reading behavior. Nothing provided establishes this installer as a supporting dependency for the declared purpose. The downloaded script's contents and any additional effects cannot be determined from this chunk.

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 network response directly into Bash without version pinning, independent integrity verification, or review. Compromise of the installer distribution path could execute arbitrary code with the agent's local permissions; HTTPS and the legitimate dependency context do not eliminate this supply-chain risk.

Content

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

The setup workflow instructs the agent to execute remote installer scripts without warning the user about system changes or remote-code execution.

Medium
Category
Output Handling
Confidence
96% confidence
Finding

The fallback directs the agent to install software by executing downloaded shell or PowerShell code without first explaining the system changes or obtaining installation approval. Although conditional on a missing CLI, this expands a read-only Pexels request into local code execution with the agent process's permissions.

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