Cyber Resilience

CVE-2026-27990

High

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 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-2026-27990 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-2026-27990 is an Improper Control of Filename for Include/Require Statement in PHP Program vulnerability, classified as PHP Remote File Inclusion but enabling PHP Local File Inclusion, affecting the ThemeREX ConFix WordPress theme. This issue impacts ConFix versions from n/a through 1.013 and is linked to CWE-98. The vulnerability carries 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 network accessibility and potential for significant impacts.

Unauthenticated remote attackers can exploit this vulnerability over the network with high attack complexity and without requiring user interaction. Successful exploitation grants high-level impacts on confidentiality, integrity, and availability, allowing attackers to perform local file inclusion on the targeted system.

Patchstack provides details on the vulnerability in the WordPress ConFix theme version 1.013 via its advisory at https://patchstack.com/database/Wordpress/Theme/confix/vulnerability/wordpress-confix-theme-1-013-local-file-inclusion-vulnerability?_s_id=cve, which security practitioners should consult for mitigation guidance.

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 ConFix confix allows PHP Local File Inclusion.This issue affects ConFix: from n/a through <= 1.013.

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-2026-27990 enables unauthenticated remote local file inclusion in a public-facing WordPress theme, directly facilitating exploitation of public-facing applications via 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-2 Flaw Remediation good match
prevent

Directly remediates the improper filename control flaw in the ConFix theme's PHP include/require statements by identifying, reporting, and patching affected versions <=1.013.

SI-10 Information Input Validation good match
prevent

Requires validation of filenames and paths used in PHP include/require operations to block malicious local file inclusion attempts.

RA-5 Vulnerability Monitoring and Scanning good match
detect

Enables scanning for this specific LFI vulnerability in WordPress themes like ConFix to identify and prioritize remediation.

References