Find and Explain Vulnerabilities

Splunk is reviewing a lightweight ingestion endpoint that forwarders use to push log events. It authenticates each forwarder with a shared per-forwarder token before accepting the event.

import traceback
from flask import Flask, request, jsonify

app = Flask(__name__)

INGEST_TOKENS = {
    "forwarder-01": "a1b2c3d4e5f6token",
    "forwarder-02": "9f8e7d6c5b4a3token",
}

@app.route("/ingest", methods=["POST"])
def ingest_event():
    forwarder_id = request.headers.get("X-Forwarder-Id")
    submitted_token = request.headers.get("X-Ingest-Token")
    expected_token = INGEST_TOKENS.get(forwarder_id, "")

    if submitted_token == expected_token:
        try:
            event = parse_event(request.data)
            store_event(event)
            return jsonify({"status": "ok"})
        except Exception as e:
            return jsonify({"error": str(e), "trace": traceback.format_exc()}), 500
    return jsonify({"error": "unauthorized"}), 401

Review this code snippet, identify the security vulnerabilities, and explain how an attacker could exploit each one. Name the OWASP Top 10 category each falls under.