CVE-2023-51414 CRITICAL

CVE-2023-51414: WordPress EnvíaloSimple Plugin <= 2.1 is vulnerable to PHP Object Injection

Vendor Envialosimple
Product EnvíaloSimple: Email Marketing y Newsletters
Weakness CWE-502 · Unsafe deserialization
Published December 29, 2023
Last update April 28, 2026
View on NVD All CVEs

CVSS base score

9.6/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

Deserialization of Untrusted Data vulnerability in EnvialoSimple EnvíaloSimple: Email Marketing y Newsletters.This issue affects EnvíaloSimple: Email Marketing y Newsletters: from n/a through 2.1.

Explanation of Vulnerability in Simple Terms

02Summary

EnvíaloSimple Email Marketing and Newsletters versions up to 2.1 contain a deserialization vulnerability that allows attackers to execute arbitrary code on the site. An attacker can craft a malicious serialized object that, when processed by the application, runs their own PHP code. The vulnerability requires user interaction—typically a victim must visit a malicious link or page—but can affect the entire site and any connected systems.

What an attacker can do

03Attacker Capabilities

Run their own code on the site and compromise user data, site content, and availability.

Potential impact on your site

04Site Impact

Complete site compromise, data theft, malware injection, and potential lateral movement to connected systems.

Conditions required to exploit

05Prerequisites

Network access and user interaction (victim must visit attacker-controlled page or link).

Key dates

06Disclosure timeline

December 29, 2023 CVE published
April 28, 2026 Record updated

Related vulnerabilities

08Related CVE

CVE-2026-49106 WordPress Integration for Contact Form 7 and Constant Contact plugin <= 1.1.6 - PHP Object Injection vulnerability CVE-2026-15962 Fluent Forms Pro Add On Pack <= 6.2.6 - Authenticated (Subscriber+) PHP Object Injection to Arbitrary User Password Change via User Meta Field CVE-2026-27333 WordPress Paid Videochat Turnkey Site plugin <= 7.3.23 - Deserialization of untrusted data vulnerability CVE-2026-57713 WordPress Events Manager plugin <= 7.3.6 - PHP Object Injection vulnerability CVE-2026-12115 Counter Box <= 2.0.13 - Authenticated (Administrator+) PHP Object Injection via Import