Fix security issue with markdown, thanks to @simhnna

app/Models/Rule.php

@@ -93,6 +93,14 @@ class Rule extends Model
         return $this->hasMany('FireflyIII\Models\RuleTrigger');
     }
 
+    /**
+     * @param $value
+     */
+    public function setDescriptionAttribute($value)
+    {
+        $this->attributes['description'] = e($value);
+    }
+
     /**
      * @codeCoverageIgnore
      * @return \Illuminate\Database\Eloquent\Relations\BelongsTo