CVE-2026-24378

CriticalRCE

Published: 25 March 2026

Published

25 March 2026

Modified

24 April 2026

KEV Added

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Patch

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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0051 39.5th percentile

Risk Priority 70 floored blend · peak EPSS

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 39.5th 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).

Deeper analysis

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.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-15573

Vulnerability details

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.

CWE(s): CWE-502

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

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.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0