system: You are an expert security code reviewer. You will be shown a source code file along with a catalog of candidate CWE (Common Weakness Enumeration) categories with their official MITRE names. Your task is to list every distinct CWE from that catalog that is actually present in the code. The catalog is comprehensive for this dataset -- the answer is a (possibly small) subset of it.

OUTPUT FORMAT: Respond with a comma-separated list of CWE IDs in the form `CWE-N`, sorted in ascending numeric order, wrapped in a single \boxed{...}. Examples: `\boxed{CWE-79}` for one, `\boxed{CWE-22,CWE-79,CWE-327}` for three. Output the boxed answer ONLY -- no explanation, no other text.

user: ```python
import re
from datetime import datetime

from city_scrapers_core.constants import COMMITTEE
from city_scrapers_core.items import Meeting
from city_scrapers_core.spiders import CityScrapersSpider


class ChiSchoolCommunityActionCouncilSpider(CityScrapersSpider):
    name = "chi_school_community_action_council"
    agency = "Chicago Public Schools"
    timezone = "America/Chicago"
    start_urls = [
        "https://www.cps.edu/services-and-supports/parent-engagement/community-action-councils-cacs/"  # noqa
    ]

    def parse(self, response):
        """
        `parse` should always `yield` Meeting items.

        Change the `_parse_title`, `_parse_start`, etc methods to fit your scraping
        needs.
        """
        # Sets month counter to the current month, passed to parse_start
        # month_counter = datetime.today().month
        month = datetime.today().month
        # Iterates through every month in the year after the current month
        for item in response.css(".smaller-headings .block"):
            source = item.css("a").css("a::attr(href)").extract_first()
            if source and "humboldparkportal.org" in source:
                continue
            if not source:
                source = response.url
            for month_counter in range(month, 13):
                start = self._parse_start(item, month_counter)
                if not start:
                    continue
                meeting = Meeting(
                    title=self._parse_title(item),
                    description="",
                    classification=COMMITTEE,
                    start=start,
                    end=None,
                    time_notes="",
                    all_day=False,
                    location=self._parse_location(item),
                    links=[],
                    source=source,
                )

                meeting["id"] = self._get_id(meeting)
                meeting["status"] = self._get_status(meeting)
                yield meeting

    def _parse_title(self, item):
        """Parse or generate event title."""
        comm_area = " ".join(item.css(".h4-style *::text").extract()).strip()
        return f"{comm_area} Community Action Council"

    @staticmethod
    def parse_weekday(item_text):
        """
        Parses the source material and retrieves the day of the week that
        the meeting occurs.
        """
        day_match = re.search(r"[A-Z][a-z]+day", item_text)
        if not day_match:
            return
        return datetime.strptime(day_match.group(), "%A").weekday()

    @staticmethod
    def parse_time(item_text):
        """
        Parses the source material and retrieves the time that the meeting
        occurs.
        """
        time_match = re.search(r"\d{1,2}(:\d\d)? ?[APMapm\.]{2,4}", item_text)
        if not time_match:
            return
        time_str = re.sub(r"[\s\.]", "", time_match.group().lower())
        time_fmt = "%I%p"
        if ":" in time_str:
            time_fmt = "%I:%M%p"
        return datetime.strptime(time_str, time_fmt).time()

    @staticmethod
    def count_days(weekday, week_count, month_counter):
        """
        Because the source material provides meeting dates on a reoccuring
        schedule, we must use the parsed day from the parse_day function
        """
        today = datetime.today()
        week_counter = 0
        for x in range(1, 31):
            try:
                current_date = datetime(today.year, month_counter, x)
                if current_date.weekday() == weekday:
                    week_counter += 1
                    if week_counter == week_count:
                        return current_date
            except ValueError:
                break

    def _parse_start(self, item, month_counter):
        """
        Parse start date and time.
        Accepts month_counter as an argument from top level parse function
        to iterate through all months in the year.
        """
        item_text = " ".join(item.css("*::text").extract())
        weekday = self.parse_weekday(item_text)
        # Selects first character in the source, usually the week count
        week_num_match = re.search(r"\d[a-z]{2} [A-Z][a-z]+day", item_text)
        if not week_num_match:
            return
        week_count = re.search(r"\d", week_num_match.group()).group()
        meeting_date = self.count_days(weekday, int(week_count), month_counter)
        if not meeting_date:
            return
        return datetime.combine(meeting_date.date(), self.parse_time(item_text))

    def _parse_location(self, item):
        """Parse or generate location."""
        lines = item.css("p *::text").extract()
        for idx, line in enumerate(lines):
            if "Where" in line:
                return {
                    "name": lines[idx + 1].strip(),
                    "address": f"{lines[idx+2].strip()} Chicago, IL",
                }
        return {"name": "", "address": ""}

```

Candidate CWE catalog (every CWE that appears anywhere in this dataset):
  - CWE-20: Improper Input Validation
  - CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  - CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
  - CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
  - CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  - CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
  - CWE-94: Improper Control of Generation of Code ('Code Injection')
  - CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
  - CWE-116: Improper Encoding or Escaping of Output
  - CWE-117: Improper Output Neutralization for Logs
  - CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
  - CWE-209: Generation of Error Message Containing Sensitive Information
  - CWE-215: Insertion of Sensitive Information Into Debugging Code
  - CWE-295: Improper Certificate Validation
  - CWE-312: Cleartext Storage of Sensitive Information
  - CWE-326: Inadequate Encryption Strength
  - CWE-327: Use of a Broken or Risky Cryptographic Algorithm
  - CWE-377: Insecure Temporary File
  - CWE-502: Deserialization of Untrusted Data
  - CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
  - CWE-611: Improper Restriction of XML External Entity Reference
  - CWE-614: Sensitive Cookie in HTTPS Session Without 'Secure' Attribute
  - CWE-643: Improper Neutralization of Data within XPath Expressions ('XPath Injection')
  - CWE-730: OWASP Top Ten 2004 Category A9 - Denial of Service
  - CWE-732: Incorrect Permission Assignment for Critical Resource
  - CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
  - CWE-918: Server-Side Request Forgery (SSRF)
  - CWE-943: Improper Neutralization of Special Elements in Data Query Logic
  - CWE-1004: Sensitive Cookie Without 'HttpOnly' Flag
  - CWE-1333: Inefficient Regular Expression Complexity

List every distinct CWE from the catalog above that is actually present in this code.
Answer: CWE-20