Cyber Resilience

CVE-2025-58998

CriticalRCE

Published: 06 November 2025

Published
06 November 2025
Modified
15 April 2026
KEV Added
—
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 0.0010 27.4th percentile
Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-58998 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 27.4th 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 RA-5 (Vulnerability Monitoring and Scanning) and SI-10 (Information Input Validation).

Deeper analysis

CVE-2025-58998 is a Deserialization of Untrusted Data vulnerability (CWE-502) in the s2Member WordPress plugin by Cristián Lávaque. The flaw allows Object Injection and affects s2Member versions from n/a through <= 250701.

With 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), the vulnerability is exploitable over the network by unauthenticated attackers requiring low complexity and no user interaction. Attackers can achieve high impacts on confidentiality, integrity, and availability through object injection.

The Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/s2member/vulnerability/wordpress-s2member-plugin-250701-php-object-injection-vulnerability?_s_id=cve details the issue in the WordPress s2Member plugin version 250701. Practitioners should review this reference for recommended mitigations, such as applying available patches.

EU & UK References

Vulnerability details

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

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?

The vulnerability is a deserialization flaw (CWE-502) in a WordPress plugin, enabling unauthenticated remote object injection with high-impact RCE on a public-facing web application.

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

CVEs Like This One

CVE-2024-13770Shared CWE-502
CVE-2026-27303Shared CWE-502
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CVE-2025-64353Shared CWE-502
CVE-2025-31047Shared CWE-502
CVE-2026-27096Shared CWE-502
CVE-2023-49886Shared CWE-502
CVE-2026-23542Shared CWE-502
CVE-2025-66631Shared CWE-502
CVE-2026-40044Shared CWE-502

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-2 Flaw Remediation good match
prevent

Flaw remediation directly mitigates the deserialization vulnerability by applying patches to vulnerable s2Member plugin versions up to 250701.

SI-10 Information Input Validation good match
prevent

Information input validation prevents object injection by rejecting or sanitizing untrusted serialized data before deserialization in the plugin.

RA-5 Vulnerability Monitoring and Scanning good match
detect

Vulnerability monitoring and scanning identifies the specific deserialization flaw in deployed s2Member plugins for timely remediation.

References