CVE-2023-40765: Phpjabbers Event Booking Calendar

Critical severity, CVSS 9.8. EPSS: 0.9% chance of exploitation in the next 30 days.

User enumeration is found in PHPJabbers Event Booking Calendar v4.0. This issue occurs during password recovery, where a difference in messages could allow an attacker to determine if the user is valid or not, enabling a brute force attack with valid users.

Affected products

• Phpjabbers Event Booking Calendar: version 4.0 only

Published 2023-08-28. Last modified 2026-06-17.