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Security audit

Mailsoftly

Security checks for vulnerabilities and agentic risk

Overview

The contact-management workflow is well controlled, but setup directs the agent to execute downloaded installers without a clear approval step or integrity checks.

Review and approve the CLI installation separately before allowing setup. Prefer a verified, pinned release and review its skill-synchronization behavior. OOMOL will mediate access to your Mailsoftly contacts. Remote installer contents were unavailable for inspection; the artifacts do not establish malicious behavior.

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
  • 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
97% confidence
Finding

The supplied command performs remote software installation rather than any visible Mailsoftly data operation. Although installing a dependency can be a supporting implementation detail, the supplied content establishes no relationship between this Oomol installer and the declared Mailsoftly functionality. The downloaded script's contents and any further 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 remote script directly into Bash without verifying its integrity or reviewing it; the PowerShell alternative has the same execution pattern. Compromise of the distribution endpoint or release pipeline could execute attacker-controlled code with the invoking user's permissions, exposing local files and credentials; HTTPS and the legitimate dependency relationship do not eliminate that risk.

Content

Scanner excerpt · SKILL.md (reported line 65)May include surrounding context.

Setup instructs execution of downloaded installation scripts without warning about local-system changes.

Medium
Category
Output Handling
Confidence
93% confidence
Finding

The setup directs the agent to execute downloaded installers when the CLI is missing, without requiring approval for local software installation or explaining its effects. This crosses from Mailsoftly account operations into local code execution, although the conditional setup requirement reduces 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 86)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