Cyber Resilience

CVE-2026-23544

HighRCE

Published: 19 February 2026

Published
19 February 2026
Modified
15 April 2026
KEV Added
—
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 0.0035 26.9th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-23544 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 26.9th 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-2026-23544 is a Deserialization of Untrusted Data vulnerability (CWE-502) in the codetipi Valenti WordPress theme, which allows Object Injection. This issue affects Valenti versions from n/a through 5.6.3.5. Published on 2026-02-19, it 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), reflecting high severity due to its potential for significant impact.

The vulnerability can be exploited by low-privileged authenticated users (PR:L) over the network (AV:N) with low attack complexity (AC:L) and no user interaction required (UI:N). Successful exploitation enables attackers to achieve high impacts on confidentiality, integrity, and availability (C:H/I:H/A:H) within the unchanged security scope (S:U), typically through PHP object injection leading to arbitrary code execution or other severe compromises on affected WordPress sites.

Patchstack's advisory at https://patchstack.com/database/Wordpress/Theme/valenti/vulnerability/wordpress-valenti-theme-5-6-3-5-php-object-injection-vulnerability?_s_id=cve documents the PHP object injection vulnerability specifically in Valenti theme version 5.6.3.5, providing details for WordPress site administrators to assess and address exposure.

OWASP Top 10 for Web (2025)

A08:2025 Software or Data Integrity Failures

EU & UK References

Vulnerability details

Deserialization of Untrusted Data vulnerability in codetipi Valenti valenti allows Object Injection.This issue affects Valenti: from n/a through <= 5.6.3.5.

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?

PHP object injection in public-facing WordPress theme directly enables remote exploitation for RCE via 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

Flaw remediation directly mitigates this deserialization vulnerability by applying patches to affected Valenti theme versions up to 5.6.3.5.

SI-10 Information Input Validation good match
prevent

Information input validation prevents object injection by ensuring untrusted data deserialized in the Valenti theme is properly validated for format, type, and safety.

RA-5 Vulnerability Monitoring and Scanning good match
detect

Vulnerability monitoring and scanning identifies the presence of this PHP object injection flaw in deployed Valenti theme instances.

References