Security Advisory - Published 2026-06-08 - PHP booking apps

Simple Flight Ticket Booking CVE-2026-11488: SQL Injection Self-Check

CVE-2026-11488 affects code-projects Simple Flight Ticket Booking System 1.0. The public record points to checkUser.php, where the POST Username parameter is reported as SQL injectable. Public exploit signal exists. If this project is exposed on a shared host, demo domain, or student portal, check it before treating it as a normal login bug.

Scope: This page is for owners and defenders. It does not include exploit payloads. Use it to identify the affected file, review logs, and plan a safe fix.

What is affected

  • Product: code-projects Simple Flight Ticket Booking System
  • Version: 1.0 in the public report
  • CVE: CVE-2026-11488
  • Reported file: checkUser.php
  • Reported argument: Username
  • Weakness: SQL injection, mapped to CWE-89 / CWE-74 in public metadata
  • Known exploited in CISA KEV: no, as of this publication

Small booking demos often stay online after a class project, client test, or old agency handoff. The risk is not only the login account. If database credentials are broad or reused, a SQL injection in the login flow can expose bookings, user data, admin records, and other tables on the same database user.

10-minute exposure check

Step 1: Confirm the application

Look for the product name in the page footer, browser title, source folder, deployment ZIP, or database name. If the system is only a demo, take it offline instead of patching it in place. 

find /var/www /home /www -iname "checkUser.php" -type f 2>/dev/null

Step 2: Inspect Username SQL handling

From the folder that contains checkUser.php, inspect the query path:

grep -nEi "Username|mysqli_query|mysql_query|query\\(|select|where" checkUser.php 2>/dev/null

Risk signs: raw POST values inside SQL strings, no prepared statements, no bound parameters, and login checks that compare submitted values directly in a query.

Step 3: Review web logs

Search for requests to the reported file and nearby login traffic:

grep -R "checkUser.php" /var/log/nginx /var/log/apache2 /usr/local/apache/logs 2>/dev/null | tail -100
grep -R "Username" /var/log/nginx /var/log/apache2 /usr/local/apache/logs 2>/dev/null | tail -100

Keep a copy of suspicious logs before changing code. Watch for repeated POST attempts, long request bodies, SQL keywords in request logs, or requests from hosting providers and scanners that do not match normal users.

Step 4: Check application and database changes

  • Unexpected admin or staff accounts
  • Bookings created, changed, or deleted outside normal hours
  • Database exports, backup files, or SQL dumps in the web root
  • New PHP files under upload, image, cache, or backup directories
  • Database user permissions broader than the booking app needs

Safe fix path

  1. Restrict access first. Put the booking system behind VPN, IP allowlist, or basic auth while you review it.
  2. Replace string-built SQL. Use prepared statements and bound parameters for the login query.
  3. Normalize login failures. Do not expose SQL errors or account enumeration clues.
  4. Reduce database privileges. The app user should only have the permissions required by this booking system.
  5. Rotate credentials if logs are suspicious. Start with app admins and database credentials.
  6. Remove stale demos. If nobody owns the app, archive it offline and delete the public vhost.

Temporary access control

If the booking system is not actively used, block the login handler until a developer has patched the SQL path: 

location = /checkUser.php {
    deny all;
    return 403;
}

If staff still need the portal, use an IP allowlist or VPN instead of leaving the handler public.

When to treat it as an incident

  • checkUser.php was public before June 8, 2026.
  • Logs show suspicious POST traffic to the login handler.
  • Bookings, admin users, or customer records changed unexpectedly.
  • The same database user is shared by other apps.
  • You cannot prove whether the system was only scanned or accessed.

Ping7 repair path

Ping7 can review small PHP booking portals for this class of issue: exposure check, login SQL review, log triage, database privilege review, and a short written cleanup plan. Start from CVE Repair and include the domain, hosting type, and whether checkUser.php is reachable.

References

Author: Ping7 security team - Published: 2026-06-08 - CVE-2026-11488 - Defensive self-check only.