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Security audit

ShortPixel

Security checks for vulnerabilities and agentic risk

Overview

ShortPixel changes require approval, but setup can run an unverified remote installer without separate consent and may change other agent skills.

Review setup before installing. Prefer installing a verified, version-pinned CLI yourself, and check its controls for automatic skill synchronization. OOMOL will mediate access to your connected ShortPixel account. Keep the skill's approval requirements for writes and deletions; the downloaded installer's full behavior remains 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 (4)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command runs an Oomol-hosted installer and contains no ShortPixel functionality or demonstrated dependency relationship. This is a materially different operation from the declared purpose. The downloaded script is not supplied, so its additional effects cannot be determined.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping an HTTPS response directly into Bash executes mutable remote code without verifying a pinned artifact or its integrity; the PowerShell alternative has the same issue. Compromise of the installer hosting or distribution pipeline could yield arbitrary execution with the invoking process's permissions, despite the legitimate dependency-installation purpose.

Content

Scanner excerpt · SKILL.md (reported line 60)May include surrounding context.

The setup workflow executes downloaded installation scripts without warning the user about local system changes or remote code execution.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The fallback instructs the agent to execute a remote installer without first obtaining informed approval for local code execution and system changes. A missing dependency can therefore expand an ordinary ShortPixel request into execution of externally supplied code with the agent process's privileges, although the conditional setup limits 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 81)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