# CVE-2026-57713: Marcus Events Manager PHP object injection in WordPress plugin

Source: https://junglewise.ai/threats/cve-2026-57713-marcus-events-manager-php-object-injection-in-wordpress-plugin  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-13. Updated: 2026-07-13  
License: CC BY 4.0 with a link back

CVE-2026-57713 · Severity: high · CVSS 8.8 · Published 2026-07-13

Events Manager is a popular WordPress plugin used to manage event registrations and bookings. A security flaw in this plugin could allow an attacker to trick a site administrator into clicking a malicious link, potentially leading to full site takeover, data theft, or the deletion of website files. This vulnerability is considered high risk because it can be used in automated attacks against thousands of websites simultaneously.

Technologies: [Marcus Sykes Events Manager](https://junglewise.ai/threats/technologies/events-manager). Vendors: [Marcus Sykes](https://junglewise.ai/threats/vendors/marcus-sykes).

## Quick answers

**Is CVE-2026-57713 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-57713 being exploited in the wild.

**How severe is CVE-2026-57713?** High severity, with a CVSS score of 8.8, published 13 July 2026.

**Which products and versions are affected?** Marcus Sykes Events Manager through 7.3.6.

**Is there a fix for CVE-2026-57713?** A patch was published on 2026-07-08: Version 7.3.7 released to address the issue Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-57713 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-57713?** Check whether you run Marcus Sykes Events Manager 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

A Deserialization of Untrusted Data vulnerability (CWE-502) exists in the Events Manager plugin for WordPress through version 7.3.6. The flaw allows for PHP Object Injection, which occurs when user-supplied input is passed to the unserialize() function without proper validation. An unauthenticated attacker can exploit this by crafting a malicious payload and tricking a privileged user into performing an action, such as clicking a link (User Interaction required). If a suitable Property-Oriented Programming (POP) chain is present on the system, this can lead to remote code execution, SQL injection, or file system manipulation. The issue is resolved in version 7.3.7.

## Affected products

- Marcus (aka @msykes) Events Manager through 7.3.6

## Timeline

- 2026-06-23: disclosed: Reported by dutafi to Patchstack
- 2026-07-08: advisory: Patchstack published advisory
- 2026-07-13: advisory: NVD published CVE record
- 2026-07-08: patched: Version 7.3.7 released to address the issue

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/Wordpress/Plugin/events-manager/vulnerability/wordpress-events-manager-plugin-7-3-6-php-object-injection-vulnerability?_s_id=cve](https://patchstack.com/database/Wordpress/Plugin/events-manager/vulnerability/wordpress-events-manager-plugin-7-3-6-php-object-injection-vulnerability?_s_id=cve)