CVE-2026-24378
Published: 25 March 2026
Summary
CVE-2026-24378 is a critical-severity Deserialization of Untrusted Data (CWE-502) vulnerability. Its CVSS base score is 9.8 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 18.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly mitigates the deserialization vulnerability by requiring timely patching of the vulnerable EventPrime plugin versions through <= 4.2.8.0.
Prevents object injection by enforcing validation and sanitization of untrusted input data prior to deserialization in the WordPress plugin.
Verifies software integrity of the plugin to detect unauthorized modifications that could enable or worsen deserialization-based exploits.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Direct unauthenticated remote exploitation of a public-facing WordPress plugin via deserialization/object injection, matching T1190 for initial access and potential RCE.
NVD Description
Deserialization of Untrusted Data vulnerability in Metagauss EventPrime eventprime-event-calendar-management allows Object Injection.This issue affects EventPrime: from n/a through <= 4.2.8.0.
Deeper analysisAI
CVE-2026-24378 is a Deserialization of Untrusted Data vulnerability (CWE-502) in the Metagauss EventPrime eventprime-event-calendar-management WordPress plugin, which allows Object Injection. The issue affects EventPrime versions from n/a through 4.2.8.0 and was published on 2026-03-25. It has a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating critical severity.
Remote unauthenticated attackers can exploit this vulnerability over the network with low attack complexity and no user interaction. Successful exploitation enables high-impact disruption to confidentiality, integrity, and availability, typically through arbitrary object injection that could lead to remote code execution or other severe compromises on affected WordPress sites.
The Patchstack advisory provides further details on this WordPress plugin vulnerability, including potential mitigation steps, at https://patchstack.com/database/Wordpress/Plugin/eventprime-event-calendar-management/vulnerability/wordpress-eventprime-plugin-4-2-8-0-php-object-injection-vulnerability?_s_id=cve.
Details
- CWE(s)