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CVE-2021-42663

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-11-05 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• Online Event Booking And Reservation System Project Online Event Booking And Reservation System: 2.3.0

References

• https://github.com/TheHackingRabbi/CVE-2021-42663
• https://www.sourcecodester.com/php/14241/online-event-booking-and-reservation-system-phpmysql.html
• https://github.com/TheHackingRabbi/CVE-2021-42663
• https://www.sourcecodester.com/php/14241/online-event-booking-and-reservation-system-phpmysql.html

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