EventPrime – Events Calendar, Bookings and Tickets <= 4.3.4.1 - Authenticated (Subscriber+) PHP Object Injection

7.5
Deserialization of Untrusted Data
CVE CVE-2026-56053
CVSS 7.5 (High)
Publicly Published June 25, 2026
Last Updated June 29, 2026
Researcher VanTastic

Description

The EventPrime – Events Calendar, Bookings and Tickets plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 4.3.4.1 via deserialization of untrusted input. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.

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Vulnerability Details for EventPrime – Events Calendar, Bookings and Tickets

Software Type Plugin
Software Slug eventprime-event-calendar-management (view on wordpress.org)
Patched? Yes
Remediation Update to version 4.3.4.2, or a newer patched version
Affected Version
  • <= 4.3.4.1
Patched Version
  • 4.3.4.2

Recent vulnerabilities in EventPrime – Events Calendar, Bookings and Tickets

# Title CVE ID CVSS Researchers Date
1 EventPrime <= 4.3.4.2 - Unauthenticated Stored Cross-Site Scripting via 'new_event_type_background_color' Parameter CVE-2026-13441 7.2 Philipp Doblhofer July 8, 2026
2 EventPrime – Events Calendar, Bookings and Tickets <= 4.3.2.1 - Unauthenticated PHP Object Injection CVE-2026-42687 8.1 hhhai May 25, 2026
3 EventPrime – Events Calendar, Bookings and Tickets <= 4.3.2.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting CVE-2026-42686 6.4 hhhai May 24, 2026
4 EventPrime – Events Calendar, Bookings and Tickets <= 4.3.2.0 - Missing Authorization CVE-2026-42669 5.3 Evan NR May 12, 2026
5 EventPrime – Events Calendar, Bookings and Tickets <= 4.3.0.0 - Authenticated (Subscriber+) Insecure Direct Object Reference CVE-2026-39518 4.3 James Pirstin April 20, 2026
6 EventPrime – Events Calendar, Bookings and Tickets <= 4.2.8.3 - Missing Authorization CVE-2026-25312 5.3 Dr. M Fahad Khan March 18, 2026
7 EventPrime – Events Calendar, Bookings and Tickets <= 4.2.8.0 - Unauthenticated PHP Object Injection CVE-2026-24378 8.1 Phat RiO March 17, 2026
8 EventPrime – Events Calendar, Bookings and Tickets <= 4.2.6.0 - Missing Authorization CVE-2025-69358 5.3 Nguyen Ba Khanh March 10, 2026
9 EventPrime <= 4.2.8.3 - Unauthenticated Information Exposure CVE-2026-25389 5.3 Bao - BlueRock February 20, 2026
10 EventPrime <= 4.2.8.4 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Event Modification via 'event_id' Parameter CVE-2026-1655 4.3 Supoj Polsawas (sp0x5ec) February 17, 2026

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