CVE-2026-22403: 
WordPress vulnerability analysis and mitigation

CVE-2026-22403 is a PHP Local File Inclusion (LFI) vulnerability in the Mikado-Themes Innovio WordPress theme, classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). It affects all versions of the Innovio theme through version 1.7. The vulnerability was published on March 5, 2026, and assigned by Patchstack. It carries a CVSS v3.1 base score of 8.1 (High), exploitable remotely without authentication or user interaction (Feedly, Patchstack).

The root cause is improper control of filename parameters used in PHP include/require statements within the Innovio theme (CWE-98), which allows an attacker to manipulate file path inputs to include arbitrary local files on the server. The attack vector is network-based, requires no privileges or user interaction, but has high attack complexity, suggesting some precondition or non-trivial exploitation step is involved. An attacker can supply a crafted file path parameter to trigger inclusion of sensitive local files or PHP-executable content already present on the server. No public proof-of-concept code has been confirmed at this time (Feedly, Patchstack).

Successful exploitation could allow an unauthenticated remote attacker to read sensitive files on the server (e.g., configuration files containing database credentials), and potentially achieve remote code execution by including PHP-executable files such as uploaded images containing embedded PHP code. This could lead to full system compromise, data theft, credential exposure, and lateral movement within the hosting environment. All three security pillars — confidentiality, integrity, and availability — are rated as High impact (Feedly).

There is currently no public proof-of-concept exploit confirmed, and no evidence of in-the-wild exploitation has been reported. The EPSS score is approximately 0.053%, indicating a low probability of exploitation in the near term. The vulnerability has not been added to the CISA Known Exploited Vulnerabilities (KEV) catalog. The high attack complexity rating suggests exploitation is non-trivial, though the lack of authentication requirements lowers the barrier for motivated attackers (Feedly).

1. Reconnaissance: Identify WordPress sites using the Mikado-Themes Innovio theme version 1.7 or earlier using tools like WPScan, Shodan, or by inspecting theme metadata in publicly accessible style.css files.
2. Identify vulnerable parameter: Analyze the theme's PHP source code or observed HTTP requests to locate file inclusion calls that accept user-controlled input (e.g., a template, file, or page parameter in theme functions).
3. Craft malicious request: Construct an HTTP request with a manipulated file path parameter targeting a sensitive local file, such as ../../../../wp-config.php or /etc/passwd, to test for LFI.
4. Escalate to RCE (if applicable): If the server allows file uploads (e.g., via WordPress media library), upload a file containing embedded PHP code (e.g., a JPEG with a PHP shell), then use the LFI to include that file path and trigger code execution.
5. Achieve objective: Extract credentials from wp-config.php, establish a web shell, or pivot to other systems using harvested credentials (Feedly).

• Network: Unusual HTTP GET or POST requests to WordPress theme endpoints containing path traversal sequences (e.g., ../, ..%2F, %2e%2e%2f) in query parameters.
• Logs: WordPress or web server access logs showing requests with file path parameters pointing to system files (e.g., /etc/passwd, wp-config.php) or uploaded media files with .php extensions.
• File System: Unexpected PHP files or web shells in the WordPress uploads directory; modified theme files containing obfuscated PHP code.
• Process: Unusual child processes spawned by the web server process (e.g., bash, curl, wget) indicating potential code execution following LFI exploitation.

Users should immediately update the Mikado-Themes Innovio theme to a version newer than 1.7 if a patched release is available. As interim mitigations, administrators should disable PHP's allow_url_include and allow_url_fopen directives in php.ini if not required, implement a Web Application Firewall (WAF) with rules to detect and block path traversal and file inclusion attempts, and enforce strict input validation on all file path parameters. Monitor server and WordPress access logs for signs of exploitation. Restrict file write permissions in the WordPress uploads directory to limit RCE escalation potential (Feedly, Patchstack).

The vulnerability was noted in the Wordfence Intelligence Weekly WordPress Vulnerability Report covering the period of February 23 to March 1, 2026, indicating it received standard industry tracking attention (Wordfence). No significant independent researcher commentary, vendor statements beyond Patchstack's disclosure, or notable social media discussion has been identified for this CVE.