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Security audit

Tisane

Security checks for vulnerabilities and agentic risk

Overview

The Tisane integration is coherent, but automatic setup executes unverified software and may install additional agent skills without clearly informing you.

Preinstall a verified CLI release and prevent automatic execution of the fallback installers. Review whether you want its additional agent skills; upstream documents OO_SKILLS_SYNC_DISABLED=1 to disable startup skill synchronization. [CLI controls](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md) Submit only text you permit OOMOL and Tisane to process. The remote installers and exact CLI build could not be verified.

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 code performs remote script execution, not Tisane searching or data retrieval. Nothing in the chunk establishes that installing the Oomol CLI is a supporting dependency for the declared purpose. The downloaded script's contents and further effects are not available for assessment.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The setup instructions pipe a mutable remote script directly into Bash without verifying its contents, signature, or expected digest; the Windows alternative uses the same download-and-execute pattern. Compromise of the distribution endpoint could execute attacker-controlled code with the agent's local privileges, although the missing-CLI prerequisite and declared Bash tool restriction may limit reachability in environments that enforce it.

Content

Scanner excerpt · SKILL.md (reported line 61)May include surrounding context.

The action workflow sends user-supplied text to third-party services without a privacy warning.

Medium
Category
Output Handling
Confidence
92% confidence
Finding

The workflow instructs the agent to submit action payloads through the OOMOL connector to Tisane, including text or person-entity data for the listed analysis actions. Although the skill identifies the services and explains credential handling, it never warns that submitted content leaves the user's environment; its blanket characterization of untagged actions as safe reads also overlooks this privacy impact.

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 82)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