diff --git a/skyeye/scripts/daily-scan.js b/skyeye/scripts/daily-scan.js
index 7f46bb64..1dfadd73 100644
--- a/skyeye/scripts/daily-scan.js
+++ b/skyeye/scripts/daily-scan.js
@@ -48,9 +48,13 @@ function sense() {
 
   // Check last scan freshness (48h threshold)
   if (manifest.last_scan) {
-    const lastScanAge = Date.now() - new Date(manifest.last_scan).getTime();
+    const lastScanTime = new Date(manifest.last_scan).getTime();
+    if (isNaN(lastScanTime)) {
+      result.issues.push('infra-manifest.last_scan 日期格式无效');
+    }
+    const lastScanAge = isNaN(lastScanTime) ? 0 : Date.now() - lastScanTime;
     const hours = Math.round(lastScanAge / (1000 * 60 * 60));
-    if (hours > 48) {
+    if (!isNaN(lastScanTime) && hours > 48) {
       result.issues.push(`infra-manifest 最后扫描距今 ${hours}h，超过 48h 阈值`);
     }
   }
@@ -125,7 +129,7 @@ function auditQuotas() {
   if (ledger.services) {
     for (const [name, data] of Object.entries(ledger.services)) {
       let usagePct = 0;
-      if (data.limit && data.used) {
+      if (data.limit && data.used !== undefined && data.used !== null) {
         usagePct = Math.round((data.used / data.limit) * 100 * 10) / 10;
       }
 
diff --git a/skyeye/scripts/guard-health.js b/skyeye/scripts/guard-health.js
index 52160534..9a89bbc1 100644
--- a/skyeye/scripts/guard-health.js
+++ b/skyeye/scripts/guard-health.js
@@ -69,9 +69,14 @@ function checkGuardHealth(filePath) {
 
   // Check 5: Last heartbeat freshness (if available)
   if (guard.health_check?.last_check) {
-    const lastCheckAge = Date.now() - new Date(guard.health_check.last_check).getTime();
-    const intervalMs = (guard.health_check.interval_hours || 6) * 60 * 60 * 1000;
-    result.checks.heartbeat_fresh = lastCheckAge < intervalMs * 3; // 3x tolerance
+    const lastCheckTime = new Date(guard.health_check.last_check).getTime();
+    if (!isNaN(lastCheckTime)) {
+      const lastCheckAge = Date.now() - lastCheckTime;
+      const intervalMs = (guard.health_check.interval_hours || 6) * 60 * 60 * 1000;
+      result.checks.heartbeat_fresh = lastCheckAge < intervalMs * 3; // 3x tolerance
+    } else {
+      result.checks.heartbeat_fresh = null; // Invalid date
+    }
   } else {
     result.checks.heartbeat_fresh = null; // No heartbeat recorded yet
   }
diff --git a/skyeye/scripts/quota-audit.js b/skyeye/scripts/quota-audit.js
index 27b56764..bb496b73 100644
--- a/skyeye/scripts/quota-audit.js
+++ b/skyeye/scripts/quota-audit.js
@@ -48,7 +48,7 @@ function auditService(name, data) {
     actions: []
   };
 
-  if (data.limit && data.used !== undefined) {
+  if (data.limit && data.used !== undefined && data.used !== null) {
     result.usage_percent = data.limit > 0
       ? Math.round((data.used / data.limit) * 100 * 10) / 10
       : 0;
diff --git a/skyeye/scripts/weekly-full.js b/skyeye/scripts/weekly-full.js
index d405bcf6..e0649ede 100644
--- a/skyeye/scripts/weekly-full.js
+++ b/skyeye/scripts/weekly-full.js
@@ -47,8 +47,17 @@ function runPhase(name, scriptPath) {
     return result;
   }
 
+  // Validate scriptPath is within expected directory
+  const resolvedScript = path.resolve(scriptPath);
+  const resolvedScriptsDir = path.resolve(SCRIPTS_DIR);
+  if (!resolvedScript.startsWith(resolvedScriptsDir)) {
+    result.status = 'error';
+    result.error = `Script path outside expected directory: ${scriptPath}`;
+    return result;
+  }
+
   try {
-    result.output = execSync(`node "${scriptPath}"`, {
+    result.output = execSync(`node "${resolvedScript}"`, {
       cwd: path.resolve(SKYEYE_DIR, '..'),
       encoding: 'utf8',
       timeout: 60000,