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Security audit

WIMM — Where Is My Money

Security checks for vulnerabilities and agentic risk

Overview

This skill gives an agent clear, user-confirmed access to a WIMM personal finance account and does not show hidden or unrelated behavior.

Install this only if you intend to let the agent access your WIMM financial data. Review confirmations carefully before approving any create, edit, or delete action, especially account and transaction deletion.

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
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Tool MisuseTool Parameter Abuse, Chaining Abuse, Unsafe Defaults
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (5)

Tool Parameter Abuse

High
Category
Tool Misuse
Confidence
80% confidence
Finding

Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).

Content

Scanner excerpt · SKILL.md (reported line 82)May include surrounding context.

md
`type` is `EXPENSE` or `INCOME`.
- Update a transaction: `PATCH /v1/transactions/<id>` with the changed fields
  (balances recompute automatically).
- Delete a transaction: `DELETE /v1/transactions/<id>`
- Create an account: `POST /v1/accounts` with `{ "name": "...", "type": "CHECKING", "currency": "USD" }`
  · update `PATCH /v1/accounts/<id>` · delete `DELETE /v1/accounts/<id>`
- Create a category: `POST /v1/categories` with

Tool Parameter Abuse

High
Category
Tool Misuse
Confidence
80% confidence
Finding

Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).

Content

Scanner excerpt · SKILL.md (reported line 84)May include surrounding context.

md
(balances recompute automatically).
- Delete a transaction: `DELETE /v1/transactions/<id>`
- Create an account: `POST /v1/accounts` with `{ "name": "...", "type": "CHECKING", "currency": "USD" }`
  · update `PATCH /v1/accounts/<id>` · delete `DELETE /v1/accounts/<id>`
- Create a category: `POST /v1/categories` with
  `{ "name": "...", "type": "EXPENSE" }` (`type` ∈ INCOME|EXPENSE|TRANSFER;
  optional `icon`, `color` as `#RRGGBB`).

Tool Parameter Abuse

High
Category
Tool Misuse
Confidence
80% confidence
Finding

Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).

Content

Scanner excerpt · SKILL.md (reported line 93)May include surrounding context.

md
(`period` ∈ WEEKLY|MONTHLY|YEARLY|CUSTOM; optional `categoryId`).
- Create a tag: `POST /v1/tags` with `{ "name": "...", "color": "#FF5733" }`
  — **both `name` and `color` (`#RRGGBB`) are required.**
  Each of categories/budgets/tags supports `PATCH /<id>` and `DELETE /<id>`.

## Examples

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 105)May include surrounding context.

md
https://wimm.my/v1/accounts | jq -r '.[0].id')

# 2) create the transaction (after confirming with the user)
curl -s -X POST -H "Authorization: Bearer $WIMM_API_KEY" \
  -H "Content-Type: application/json" \
  -d "{\"accountId\":\"$ACC\",\"amount\":40,\"type\":\"EXPENSE\",\"description\":\"groceries\",\"date\":\"$(date +%F)\"}" \
  https://wimm.my/v1/transactions | jq

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 121)May include surrounding context.

md
https://wimm.my/v1/accounts | jq -r '.[0].id')

# 2) create the transaction (after confirming with the user)
curl -s -X POST -H "Authorization: Bearer $WIMM_API_KEY" \
  -H "Content-Type: application/json" \
  -d "{\"accountId\":\"$ACC\",\"amount\":40,\"type\":\"EXPENSE\",\"description\":\"groceries\",\"date\":\"$(date +%F)\"}" \
  https://wimm.my/v1/transactions | jq