system: You are an expert security code reviewer. You will be shown a source code file along with a multi-select question listing several CWE (Common Weakness Enumeration) categories. Your task is to identify which of the listed CWEs are present in the code.

OUTPUT FORMAT: Respond with the letter(s) of all correct options, sorted alphabetically and comma-separated, wrapped in a single \boxed{...}. Examples: `\boxed{A}` for one correct, `\boxed{A,C}` for two, `\boxed{A,C,E}` for three. Output the boxed answer ONLY -- no explanation, no other text.

user: ```python
from flask import jsonify, session, request, make_response
from flask_restful import Resource

from api.db import db
from api.models.post_tag import PostTag

from api.resources.authentication import requires_auth

class PostTagResource(Resource):
    def get(self, id):
        """
        Returns a post tag by id.
        ---
        tags:
            - Posts
        parameters:
        - name: id
          in: query
          schema:
            type: integer
        responses:
            200:
                description: OK
        """   
        tag = PostTag.query.get(id)
        return jsonify(tag.to_dict())


    @requires_auth
    def put(self, id, user):
        """
        Edits a post tag.
        ---
        tags:
            - Posts
        parameters:
        - name: id
          in: query
          schema:
            type: integer
        - name: tag
          in: body
          schema:
            type: object
            properties:
              title:
                type: number
        responses:
            200:
                description: OK
        """
        try:
            data = request.form
            tag = PostTag.query.get(id)
            if data.get("title"):
                tag.title = data.get("title")
            
            db.session.commit()
            return make_response(jsonify(success=True))
        except Exception as error:
            return make_response(jsonify(success=False, error=str(error)), 403)

class PostTagAddResource(Resource):
    def post(self):
        """
        Adds a new post tag.
        ---
        tags:
            - Posts
        parameters:
        - name: id
          in: query
          schema:
            type: integer
        - name: tag
          in: body
          schema:
            type: object
            properties:
              title:
                type: number
        responses:
            200:
                description: OK
        """
        try:
            data = request.form
            tag = PostTag()
            if data.get("title"):
                tag.title = data.get("title")

            db.session.add(tag)
            db.session.commit()
            return make_response(jsonify(success=True, id=tag.id))
        except Exception as error:
            return make_response(jsonify(success=False, error=str(error)), 403)
        
class PostTagListResource(Resource):
    def get(self):
        """
        Returns a list of all post tags.
        ---
        tags:
            - Posts
        responses:
            200:
                description: OK
        """

        page = request.args.get('page', 1, type=int)
        per_page = request.args.get('perPage', 20, type=int)

        tags = PostTag.query.paginate(page=page, per_page=per_page)
        data = [tag.to_dict() for tag in tags.items]
        total_count = tags.total
        return jsonify({"data": data, "totalCount": total_count})

```

Which of the following CWE vulnerability categories are present in this code? Multiple options may be correct.

  A) CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
  B) CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
  C) CWE-209: Generation of Error Message Containing Sensitive Information
  D) CWE-502: Deserialization of Untrusted Data
  E) CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
  F) CWE-643: Improper Neutralization of Data within XPath Expressions ('XPath Injection')
Answer: C