CVE-2021-42663

Name: CVE-2021-42663
Creator: NVD / NIST
Published: 2021-11-05T13:15:07.63+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 3.79%

Last modified Jun 17, 2026

CVE-2021-42663 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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. EPSS estimates a 3.79% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

EPSS Probability

3.79%

88.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Online Event Booking And Reservation System Project	Online Event Booking And Reservation System	2.3.0

References

https://github.com/TheHackingRabbi/CVE-2021-42663Exploit, Third Party Advisory
https://www.sourcecodester.com/php/14241/online-event-booking-and-reservation-system-phpmysql.htmlProduct, Third Party Advisory
https://github.com/TheHackingRabbi/CVE-2021-42663Exploit, Third Party Advisory
https://www.sourcecodester.com/php/14241/online-event-booking-and-reservation-system-phpmysql.htmlProduct, Third Party Advisory

Timeline

Published: Nov 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42663?

How severe is CVE-2021-42663?

CVE-2021-42663 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 3.79% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42663?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-42663?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST