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Security audit

Sendmator

Security checks for vulnerabilities and agentic risk

Overview

The contact operations require approval, but the CLI dependency can make persistent changes to other local agents that this skill does not explain.

Review the CLI setup before allowing automatic installation. OOMOL will mediate access to your contacts, and deletion is permanent. Prefer an independently reviewed CLI installation and control its skill synchronization; the publisher documents OO_SKILLS_SYNC_DISABLED for startup synchronization. The remote installers and hosted service were not verified, and no malicious behavior was established.

A.I.G

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

SkillSpector

Vulnerability Patterns
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
Findings (3)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
97% confidence
Finding

The supplied command executes an Oomol-hosted installer rather than performing Sendmator operations. Nothing provided establishes that this installer is a supporting dependency for Sendmator, so the observed behavior materially differs from the declared purpose. The downloaded script's contents and any further effects are unknown.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The fallback installation command pipes a remotely fetched, unpinned script directly into Bash; the Windows alternative similarly executes downloaded content immediately. If the distribution endpoint or release pipeline is compromised, attacker-controlled code runs with the invoking user's permissions and could access local files or credentials. Restricting installation to a missing-CLI error reduces exposure, but neither verifies the script nor explicitly requires approval for host-level installation.

Content

Scanner excerpt · SKILL.md (reported line 59)May include surrounding context.

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 80)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