Cyber Resilience

CVE-2026-22454

CriticalRCE

Published: 05 March 2026

Published
05 March 2026
Modified
22 April 2026
KEV Added
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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-2026-22454 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-10 (Information Input Validation).

Deeper analysis

CVE-2026-22454 is a Deserialization of Untrusted Data vulnerability (CWE-502) in the ThemeREX Solaris WordPress theme, enabling Object Injection. Published on 2026-03-05, this issue affects Solaris versions from n/a through <=2.5.

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 exploitation over the network by unauthenticated attackers requiring low complexity and no user interaction. Successful exploitation can result in high impacts to confidentiality, integrity, and availability through object injection.

The Patchstack advisory (https://patchstack.com/database/Wordpress/Theme/solaris/vulnerability/wordpress-solaris-theme-2-5-php-object-injection-vulnerability?_s_id=cve) documents this PHP Object Injection vulnerability in the WordPress Solaris theme version 2.5.

OWASP Top 10 for Web (2025)

A08:2025 Software or Data Integrity Failures

EU & UK References

Vulnerability details

Deserialization of Untrusted Data vulnerability in ThemeREX Solaris solaris allows Object Injection.This issue affects Solaris: from n/a through <= 2.5.

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 →
Why these techniques?

Remote unauthenticated PHP object injection in public-facing WordPress theme directly enables exploitation of a web application (T1190).

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

Mandates timely identification, reporting, prioritization, and remediation of flaws such as the PHP object injection via deserialization of untrusted data in Solaris <=2.5.

SI-10 Information Input Validation good match
prevent

Implements information input validation at entry points to reject or sanitize untrusted serialized data, directly preventing object injection exploitation.

RA-5 Vulnerability Monitoring and Scanning good match
detect

Conducts vulnerability scanning to identify the deserialization vulnerability (CVE-2026-22454) in the ThemeREX Solaris WordPress theme for remediation.

References