Cyber Resilience

CVE-2026-22501

CriticalRCE

Published: 05 March 2026

Published
05 March 2026
Modified
22 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 0.0051 39.5th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-22501 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 RA-5 (Vulnerability Monitoring and Scanning) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-22501 is a Deserialization of Untrusted Data vulnerability (CWE-502) in the Mounthood WordPress theme developed by axiomthemes. The flaw enables Object Injection and affects the Mounthood theme from unknown initial versions through 1.3.2.

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 allows remote attackers to exploit it over the network with low attack complexity, requiring no privileges or user interaction. Successful exploitation can lead to high impacts on confidentiality, integrity, and availability through arbitrary object injection.

The Patchstack advisory provides further details on this PHP Object Injection vulnerability in the Mounthood WordPress theme version 1.3.2, available at https://patchstack.com/database/Wordpress/Theme/mounthood/vulnerability/wordpress-mounthood-theme-1-3-2-php-object-injection-vulnerability?_s_id=cve.

OWASP Top 10 for Web (2025)

A08:2025 Software or Data Integrity Failures

EU & UK References

Vulnerability details

Deserialization of Untrusted Data vulnerability in axiomthemes Mounthood mounthood allows Object Injection.This issue affects Mounthood: from n/a through <= 1.3.2.

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 remote exploitation of a public-facing web application (WordPress theme) via unsafe PHP deserialization/object injection, matching T1190 exactly with no authentication required.

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

CVEs Like This One

CVE-2025-62368Shared CWE-502
CVE-2025-68903Shared CWE-502
CVE-2025-67911Shared CWE-502
CVE-2025-54014Shared CWE-502
CVE-2026-22505Shared CWE-502
CVE-2025-53078Shared CWE-502
CVE-2026-43633Shared CWE-502
CVE-2025-60039Shared CWE-502
CVE-2026-25429Shared CWE-502
CVE-2025-7697Shared CWE-502

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-2 Flaw Remediation good match
prevent

Requires identification, reporting, and correction of the deserialization flaw in the Mounthood WordPress theme to prevent remote object injection exploitation.

RA-5 Vulnerability Monitoring and Scanning good match
detect

Scans for vulnerabilities like CVE-2026-22501 in the Mounthood theme, enabling detection of affected versions and prioritization of remediation.

SI-10 Information Input Validation partial match
prevent

Validates untrusted inputs to the WordPress theme, mitigating injection of malicious serialized objects even prior to full patching.

References