groupaassage

• Outcome: Pass
• Latest audit: Sep 11, 2026 · 6:28 PM UTC
• Version: 1.0.0

Overview

This skill is a Chinese daily-report HTML template with limited theme-setting JavaScript and no evidence of deceptive, destructive, or credential-seeking behavior.

Reasonable to install if you want this Chinese daily-report HTML format. If reports will be embedded with untrusted pages or served across origins, harden the generated postMessage code by checking origin/source and allowing only light or dark theme values.

A.I.G

Vulnerability Patterns

• Insecure Skill Coding Practices: Finds exploitable flaws such as hardcoded secrets or command injection
• Skill Instruction Hijacking: Alters the agent's session goals or safety constraints when the skill loads
• Agent Memory Poisoning: Writes attacker-controlled rules into memory that affect later sessions
• Remote Payload Retrieval and Execution: Fetches external code whose behavior can change after review
• Embedded Malicious Code: Ships malicious scripts inside the skill and executes them locally

Findings (1)

T09 · Insecure Skill Coding Practices

Note

• Location: skill.md:155

Finding

Unrestricted Cross-Window Theme Synchronization Messages

Content

View full analysis

Vulnerability Details

File Location: skill.md, lines 155-162 and 316-328
Vulnerability Type: Unvalidated cross-window messaging
Risk Level: Low

Vulnerable Code

javascript

window.addEventListener('message', function (e) {
  if (e.data && e.data.type === 'pusa-theme') {
    const theme = e.data.theme;
    document.documentElement.setAttribute('data-theme', theme);
    localStorage.setItem('pusa-theme', theme);
    const btn = document.getElementById('themeToggle');
    if (btn) btn.textContent = theme === 'dark' ? '☀️ 明亮' : '🌙 暗黑';
  }
});

javascript

const iframe = document.querySelector('#iframeContainer iframe');
if (iframe && iframe.contentWindow) {
  try { iframe.contentWindow.postMessage({ type: 'pusa-theme', theme: next }, '*'); } catch(e) {}
}

javascript

iframe.onload = () => {
  const theme = document.documentElement.getAttribute('data-theme');
  try { iframe.contentWindow.postMessage({ type: 'pusa-theme', theme }, '*'); } catch(e) {}
};

Technical Analysis

The prescribed message listener trusts any message whose payload contains a matching type. It does not validate e.origin or e.source, and it does not restrict e.data.theme to the expected dark and light values. An untrusted window with a reference to the generated report can therefore supply an arbitrary string that is persisted in localStorage and assigned to the root element's data-theme attribute.

The sending examples also use the wildcard target origin '*'. If the iframe is navigated to an unexpected origin before a message is sent, that recipient can receive the theme synchronization payload.

This does not directly establish script execution because the value is assigned through setAttribute and textContent, rather than inserted as executable HTML. The confirmed exposure is unauthorized cross-window state manipulation and overly broad message delivery.

Att

...[truncated 1396 chars]

Remediation

View remediation

Remediation Suggestions

1. Permit messages only from the exact trusted application origin:

   javascript

   const TRUSTED_ORIGIN = 'https://reports.example.com';
   
   window.addEventListener('message', function (e) {
     if (e.origin !== TRUSTED_ORIGIN) return;
     if (e.source !== window.parent) return;
     if (!e.data || e.data.type !== 'pusa-theme') return;
     if (!['dark', 'light'].includes(e.data.theme)) return;
   
     const theme = e.data.theme;
     document.documentElement.setAttribute('data-theme', theme);
     localStorage.setItem('pusa-theme', theme);
   
     const btn = document.getElementById('themeToggle');
     if (btn) {
       btn.textContent = theme === 'dark' ? '☀️ Light' : '🌙 Dark';
     }
   });
   

2. Replace wildcard target origins with the recipient's exact origin:

   javascript

   iframe.contentWindow.postMessage(
     { type: 'pusa-theme', theme: next },
     TRUSTED_ORIGIN
   );
   

3. Validate locally restored values before applying them:

   javascript

   const stored = localStorage.getItem('pusa-theme');
   const theme = stored === 'light' || stored === 'dark' ? stored : 'dark';
   

4. Verify that the iframe URL belongs to the expected origin before sending a message. Where feasible, also compare the incoming event's source with the known parent or iframe window.

5. If cross-origin synchronization is unnecessary, remove postMessage synchronization entirely and keep theme selection local to each document.

SkillSpector

Vulnerability Patterns

• Prompt Injection: Instruction Override, Hidden Instructions, Exfiltration Commands
• Data Exfiltration: External Transmission, Env Variable Harvesting, File System Enumeration
• Privilege Escalation: Excessive Permissions, Sudo/Root Execution, Credential Access
• Supply Chain: Unpinned Dependencies, External Script Fetching, Obfuscated Code
• Excessive Agency: Unrestricted Tool Access, Autonomous Decision Making, Scope Creep

Findings (1)

Natural-Language Policy Violations

Medium

• Category: Not specified by scanner
• Confidence: 93% confidence

Finding

The template requires <html lang="zh-CN">, which imposes a specific language/locale on all generated output. The document does not provide user opt-in, alternative locale handling, or a stated region-specific compliance reason, so this is a natural-language policy concern.

Content

No source excerpt is available for this finding.