CVE-2026-25359

HighRCE

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

EPSS Score 0.0034 26.2th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-25359 is a high-severity Deserialization of Untrusted Data (CWE-502) vulnerability. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 26.2th 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-2026-25359 is a Deserialization of Untrusted Data vulnerability (CWE-502) in the Pendulum WordPress theme developed by rascals, enabling Object Injection. Published on 2026-03-25, it affects all versions of Pendulum from n/a through those prior to 3.1.5.

The vulnerability carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating it is exploitable over the network with low attack complexity by low-privileged users, such as authenticated WordPress contributors, without requiring user interaction. Successful exploitation can result in high impacts to confidentiality, integrity, and availability, potentially allowing arbitrary code execution or other severe compromises via injected objects.

The Patchstack advisory at https://patchstack.com/database/Wordpress/Theme/pendulum/vulnerability/wordpress-pendulum-theme-3-1-5-php-object-injection-vulnerability?_s_id=cve documents the PHP Object Injection issue in the Pendulum theme and identifies updating to version 3.1.5 as the mitigation.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-15681

Vulnerability details

Deserialization of Untrusted Data vulnerability in rascals Pendulum pendulum allows Object Injection.This issue affects Pendulum: from n/a through < 3.1.5.

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 →

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

Why these techniques?

PHP object injection (unsafe deserialization) in public-facing WordPress theme directly enables remote code execution from low-privileged accounts, mapping to exploitation of public-facing apps for initial access/impact and privilege escalation.

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