CVE-2026-22403

High

Published: 05 March 2026

Published

05 March 2026

Modified

23 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 0.0050 39.1th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-22403 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 39.1th 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 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-22403 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, in the Mikado-Themes Innovio WordPress theme. This flaw affects all versions of Innovio from n/a through 1.9, stemming from 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 potential for significant confidentiality, integrity, and availability impacts.

Attackers can exploit this vulnerability over the network without authentication or user interaction, though it requires high attack complexity. Successful exploitation allows remote attackers to perform local file inclusion, potentially leading to arbitrary code execution, data exposure, or system compromise on the targeted WordPress site running the vulnerable Innovio theme.

The Patchstack advisory at https://patchstack.com/database/Wordpress/Theme/innovio/vulnerability/wordpress-innovio-theme-1-7-local-file-inclusion-vulnerability?_s_id=cve details the local file inclusion issue in the Innovio theme, recommending updates to patched versions beyond 1.9 for mitigation.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-9537

Vulnerability details

Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in Mikado-Themes Innovio innovio allows PHP Local File Inclusion.This issue affects Innovio: from n/a through <= 1.9.

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 an unauthenticated remote Local File Inclusion (LFI) in a public-facing WordPress theme PHP component, directly enabling exploitation of a public-facing application.

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