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Security audit

Readwise

Security checks for vulnerabilities and agentic risk

Overview

The Readwise workflow is coherent, but setup can execute an unchecked downloaded installer and introduce broader changes to agent skills without clear user control.

Review the CLI installation separately before allowing automatic setup. Check which agent skills it installs or updates and consider disabling startup synchronization using the publisher's documented OO_SKILLS_SYNC_DISABLED setting ([command reference](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md)). Connecting Readwise authorizes OOMOL to access that account; confirm each proposed data change. The review concern is setup control and under-disclosed persistent changes, not evidence of data theft or 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 chunk installs software from cli.oomol.com rather than performing Readwise operations. Although installation can be a supporting implementation detail, nothing supplied establishes that this installer supports Readwise. The downloaded script's contents and subsequent effects are not visible, so no additional behavior can be confirmed.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The curl-to-bash pipeline immediately executes the remote response without version pinning or independent integrity verification. If the installer distribution infrastructure is compromised, an attacker could execute code with the agent's permissions and potentially access local files or credentials; the legitimate OOMOL dependency and HTTPS transport do not eliminate that supply-chain risk.

Content

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

First-time setup executes remote installation scripts without warning about system changes or remote-code execution.

Medium
Category
Output Handling
Confidence
96% confidence
Finding

The setup instructions direct the agent to execute downloaded shell or PowerShell code when the CLI is missing, without requiring explicit approval for local software installation or explaining its effects. This fallback is conditional, which limits exposure, but it can turn an ordinary Readwise request into execution of unreviewed code with the agent's local 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 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