Cyber Resilience

CVE-2026-28092

High

Published: 05 March 2026

Published
05 March 2026
Modified
22 April 2026
KEV Added
—
Patch
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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-2026-28092 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 RA-5 (Vulnerability Monitoring and Scanning) and SI-10 (Information Input Validation).

Deeper analysis

CVE-2026-28092 is an Improper Control of Filename for Include/Require Statement in PHP Program vulnerability, referred to as PHP Remote File Inclusion but enabling PHP Local File Inclusion, in the ThemeREX Sounder WordPress theme. This issue affects Sounder versions from n/a through 1.3.11 and is associated with CWE-98. The vulnerability was published on 2026-03-05 with a CVSS v3.1 base score of 8.1 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating high severity due to potential high impacts on confidentiality, integrity, and availability.

Unauthenticated attackers can exploit this vulnerability over the network with high attack complexity and no user interaction required. Successful exploitation allows PHP Local File Inclusion, enabling attackers to include and potentially execute arbitrary local files on the server, which could lead to sensitive data exposure, server compromise, or further privilege escalation depending on the environment.

The Patchstack advisory at https://patchstack.com/database/Wordpress/Theme/sounder/vulnerability/wordpress-sounder-theme-1-3-11-local-file-inclusion-vulnerability?_s_id=cve details the local file inclusion vulnerability in the WordPress Sounder theme version 1.3.11 and provides information on patches and mitigation strategies for affected installations.

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 Sounder sounder allows PHP Local File Inclusion.This issue affects Sounder: from n/a through <= 1.3.11.

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?

The vulnerability is a local file inclusion in a public-facing WordPress theme allowing unauthenticated attackers to execute arbitrary local PHP files remotely, directly enabling T1190: Exploit Public-Facing Application.

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

SI-10 mandates validation of information inputs, directly preventing LFI by ensuring filenames supplied to PHP include/require statements are sanitized and validated.

SI-2 Flaw Remediation good match
prevent

SI-2 requires timely identification, reporting, and correction of flaws, directly mitigating this CVE through patching the vulnerable ThemeREX Sounder WordPress theme.

RA-5 Vulnerability Monitoring and Scanning good match
detect

RA-5 employs vulnerability scanning to identify LFI vulnerabilities like CVE-2026-28092 in web applications such as the Sounder theme.

References