What is the CVSS score of CVE-2026-22454?

CVE-2026-22454 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of ThemeREX Solaris are affected by CVE-2026-22454?

A critical deserialization vulnerability in ThemeREX Solaris (versions ≤2.5) allows unauthenticated attackers to inject malicious objects and achieve remote code execution with a 9.8 CVSS score.

How to fix or mitigate CVE-2026-22454?

Within 24 hours: Inventory all systems running ThemeREX Solaris and isolate affected environments from production networks if feasible. Within 7 days: Implement WAF rules to block deserialization payloads, disable Solaris if not critical to operations, and apply compensating controls listed below. Within 30 days: Monitor vendor channels closely for patch availability and prepare an expedited deployment plan once released.

ThemeREX Solaris CVE-2026-22454

CRITICAL

Deserialization of Untrusted Data (CWE-502)

2026-03-05 audit@patchstack.com

Deserialization

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Re-analysis Queued

Apr 22, 2026 - 21:37 vuln.today

cvss_changed

Analysis Generated

Mar 12, 2026 - 22:06 vuln.today

CVE Published

Mar 05, 2026 - 06:16 nvd

CRITICAL 9.8

DescriptionCVE.org

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

AnalysisAI

Deserialization of untrusted data in Solaris (solaris) WordPress theme allows PHP Object Injection, potentially enabling remote code execution through POP chains.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Send malicious serialized object to Solaris endpoint

Exploit

Trigger unsafe deserialization in theme processing

Execution

Inject arbitrary PHP objects

Impact

Execute remote code with application privileges

Access

Send malicious serialized object to Solaris endpoint

Exploit

Trigger unsafe deserialization in theme processing

Execution

Inject arbitrary PHP objects

Impact

Execute remote code with application privileges

Vulnerability AssessmentAI

Exploitation	ThemeREX Solaris plugin version 2.5 or earlier with deserialization endpoint accessible. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	CVSS 9.8. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	Attacker submits serialized PHP payload through solaris theme, triggering Object Injection that chains to file write or code execution via available POP gadgets.
Remediation	Update the theme. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Inventory all systems running ThemeREX Solaris and isolate affected environments from production networks if feasible. …

Threat intelligence, references, and detailed analysis are available after sign-in.

CVE-2026-22454 vulnerability details – vuln.today

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ThemeREX Solaris CVE-2026-22454

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

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Attack ChainAIDerived

Vulnerability AssessmentAI

Recommended ActionAI

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External POC / Exploit Code