CVE-2025-58998 CRITICAL

CVE-2025-58998: WordPress s2Member Plugin <= 250701 - PHP Object Injection Vulnerability

Vendor Cristián Lávaque
Product s2Member
Weakness CWE-502 · Unsafe deserialization
Published November 6, 2025
Last update April 28, 2026
View on NVD All CVEs

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

Deserialization of Untrusted Data vulnerability in Cristián Lávaque s2Member s2member allows Object Injection.This issue affects s2Member: from n/a through <= 250701.

Explanation of Vulnerability in Simple Terms

02Summary

s2Member contains a deserialization vulnerability that allows unauthenticated attackers to execute arbitrary code on affected sites. The vulnerability exists in how the plugin processes untrusted serialized data without proper validation. An attacker can exploit this remotely without user interaction to gain full control of the site, including reading sensitive data, modifying content, and disrupting service.

What an attacker can do

03Attacker Capabilities

Run arbitrary code on the site and take complete control without authentication.

Potential impact on your site

04Site Impact

Complete site compromise: attackers can steal data, modify content, create admin accounts, or take the site offline.

Conditions required to exploit

05Prerequisites

Network access to the site; no authentication or user interaction required.

Key dates

06Disclosure timeline

November 6, 2025 CVE published
April 28, 2026 Record updated