Cyber Resilience

CVE-2026-28066

High

Published: 05 March 2026

Published
05 March 2026
Modified
22 April 2026
KEV Added
—
Patch
—
CVSS Score v3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0040 32.0th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-28066 is a high-severity PHP Remote File Inclusion (CWE-98) vulnerability. Its CVSS base score is 8.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 32.0th 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 CM-6 (Configuration Settings) and SI-10 (Information Input Validation).

Deeper analysis

CVE-2026-28066 is an Improper Control of Filename for Include/Require Statement in PHP Program vulnerability, described as a PHP Remote File Inclusion issue that enables PHP Local File Inclusion, in the ThemeREX Legrand WordPress theme. This flaw affects Legrand versions from n/a through 2.17.

Unauthenticated attackers with network access can exploit the vulnerability, which requires high attack complexity and no user interaction. Exploitation yields high impacts on confidentiality, integrity, and availability, per its CVSS v3.1 base score of 8.1 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H), potentially allowing inclusion of arbitrary local files.

The Patchstack advisory provides details on this WordPress Legrand theme vulnerability, including mitigation guidance, at https://patchstack.com/database/Wordpress/Theme/legrand/vulnerability/wordpress-legrand-theme-2-17-local-file-inclusion-vulnerability?_s_id=cve.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability details

Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in ThemeREX Legrand legrand allows PHP Local File Inclusion.This issue affects Legrand: from n/a through <= 2.17.

CWE(s)
CWE-98

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?

CVE-2026-28066 is a network-accessible LFI/RFI vulnerability in a public-facing WordPress theme, enabling unauthenticated attackers to achieve RCE or local file disclosure, directly mapping to Exploit Public-Facing Application (T1190).

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

CVEs Like This One

CVE-2025-58923Shared CWE-98
CVE-2025-69057Shared CWE-98
CVE-2024-54263Shared CWE-98
CVE-2026-28035Shared CWE-98
CVE-2026-28024Shared CWE-98
CVE-2025-67525Shared CWE-98
CVE-2025-22707Shared CWE-98
CVE-2025-69375Shared CWE-98
CVE-2026-22443Shared CWE-98
CVE-2025-53198Shared CWE-98

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly mitigates improper control of filenames in PHP include/require by requiring validation and sanitization of inputs to prevent local file inclusion.

SI-2 Flaw Remediation good match
prevent

Ensures timely patching of the vulnerable Legrand WordPress theme versions through <=2.17 to remediate the specific LFI flaw.

CM-6 Configuration Settings good match
prevent

Establishes restrictive PHP configuration settings like open_basedir to limit file system access and block LFI exploitation attempts.

References