# CVE-2026-56053: EventPrime PHP object injection in Subscriber role

Source: https://junglewise.ai/threats/cve-2026-56053-eventprime-php-object-injection-in-subscriber-role  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-25. Updated: 2026-06-25  
License: CC BY 4.0 with a link back

CVE-2026-56053 · Severity: high · CVSS 8.8 · Published 2026-06-25

EventPrime is a WordPress plugin used for managing event calendars and bookings. A security vulnerability in this plugin allows logged-in users with basic 'Subscriber' permissions to inject malicious data that the server processes incorrectly. This could lead to a complete takeover of the website, unauthorized access to sensitive data, or a total service outage.

Technologies: [EventPrime](https://junglewise.ai/threats/technologies/eventprime). Vendors: [EventPrime](https://junglewise.ai/threats/vendors/eventprime).

## Quick answers

**Is CVE-2026-56053 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-56053 being exploited in the wild.

**How severe is CVE-2026-56053?** High severity, with a CVSS score of 8.8, published 25 June 2026.

**Which products and versions are affected?** EventPrime <= 4.3.4.1.

**Is there a fix for CVE-2026-56053?** A patch was published on 2026-06-25: Fixed in version 4.3.4.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-56053 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-56053?** Check whether you run EventPrime at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The EventPrime plugin for WordPress (versions <= 4.3.4.1) is vulnerable to PHP Object Injection due to improper deserialization of user-supplied input. An attacker with Subscriber-level privileges can exploit this by submitting specially crafted input to a vulnerable endpoint. If a suitable Property-Oriented Programming (POP) chain is present on the server, this can lead to remote code execution, SQL injection, or arbitrary file deletion. The issue is fixed in version 4.3.4.2.

## Affected products

- EventPrime EventPrime <= 4.3.4.1

## Timeline

- 2026-05-31: other: Reported by VanTastic
- 2026-06-25: disclosed
- 2026-06-25: patched: Fixed in version 4.3.4.2

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/wordpress/plugin/eventprime-event-calendar-management/vulnerability/wordpress-eventprime-plugin-4-3-4-1-php-object-injection-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/eventprime-event-calendar-management/vulnerability/wordpress-eventprime-plugin-4-3-4-1-php-object-injection-vulnerability?_s_id=cve)

## Related threats

- [EventPrime PHP Object Injection in Event Calendar Management](https://junglewise.ai/threats/cve-2026-42687-eventprime-php-object-injection-in-event-calendar-management)
- [EventPrime Cross Site Scripting in WordPress plugin](https://junglewise.ai/threats/cve-2026-42686-eventprime-cross-site-scripting-in-wordpress-plugin)
- [EventPrime IDOR in WordPress plugin allows Subscriber data access](https://junglewise.ai/threats/cve-2026-39518-eventprime-idor-in-wordpress-plugin-allows-subscriber-data-access)
- [EventPrime Missing Authorization in Access Control Security Levels](https://junglewise.ai/threats/cve-2026-42669-eventprime-missing-authorization-in-access-control-security)