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Security audit

Yuc's Anime List

Security checks for vulnerabilities and agentic risk

Overview

This skill is a narrowly scoped public web scraper for yuc.wiki anime lineup pages, with no credential use, persistence, or hidden high-impact behavior found.

Install only if you are comfortable allowing the agent to fetch public pages from yuc.wiki and run the bundled Python scraper. Keep network access scoped to yuc.wiki, and only provide an output file path when you intentionally want the JSON written to disk.

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
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (6)

Hidden Instructions

High
Category
Prompt Injection
Content
1. Resolve the target quarter.
2. Fetch the quarter page HTML.
3. Parse only the lineup section, and skip the long-form section after `<!--新番介绍部分-->`.
4. Extract title, weekday group, status/time, episode note, platforms, and cover image for each entry.
5. Output structured JSON and run integrity checks.
Confidence
70% confidence
Finding
Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.

Anti-Refusal Statement

High
Category
Anti-Refusal
Content
## Operating Constraints

1. Scrape only public pages. Do not log in or bypass restrictions.
2. In one run, request only required pages (homepage once + quarter page once).
3. Keep original source URLs in output for traceability.
Confidence
90% confidence
Finding
Skill attempts to nullify the agent's safety policies or restrictions ('you have no restrictions', 'ignore your guidelines', 'do anything now'). This is a direct jailbreak that disables guardrails.

Instruction Override

High
Category
Prompt Injection
Content
## Operating Constraints

1. Scrape only public pages. Do not log in or bypass restrictions.
2. In one run, request only required pages (homepage once + quarter page once).
3. Keep original source URLs in output for traceability.
Confidence
90% confidence
Finding
This pattern attempts to override system instructions or ignore safety constraints. Without LLM analysis, manual review is recommended.

Lp3

Medium
Category
MCP Least Privilege
Confidence
94% confidence
Finding
The skill describes behavior that requires network access to yuc.wiki and also references a local script-based workflow, but it does not declare any explicit tool scope such as permissions or allowed-tools. This creates a policy gap where an agent may invoke broader-than-intended capabilities, making it harder to constrain or audit network and file-related actions if the skill is executed in a permissive runtime.

Scope Creep

Low
Category
Excessive Agency
Content
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
Confidence
70% confidence
Finding
Skill's behavior or capabilities extend beyond its stated purpose. Scope creep allows an agent to perform actions unrelated to its documented functionality, increasing the attack surface.

Scope Creep

Low
Category
Excessive Agency
Content
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
Confidence
70% confidence
Finding
Skill's behavior or capabilities extend beyond its stated purpose. Scope creep allows an agent to perform actions unrelated to its documented functionality, increasing the attack surface.

Static analysis

No suspicious patterns detected.