CVE-2026-22403 is a Local File Inclusion (LFI) vulnerability found in the Mikado-Themes Innovio WordPress theme, affecting versions up to 1.7. The vulnerability arises from improper control over the filename parameter used in PHP include or require statements, allowing an attacker to manipulate the input to include arbitrary local files on the web server. This can lead to disclosure of sensitive files such as configuration files, password files, or other critical data stored on the server. While the description mentions 'PHP Remote File Inclusion,' the actual issue is a Local File Inclusion, which is typically easier to exploit when remote file inclusion protections are in place. The vulnerability is due to insufficient input validation or sanitization of user-supplied data used in file inclusion functions. No patches or fixes have been linked yet, and no known exploits are currently in the wild, but the flaw is publicly disclosed and documented in the CVE database. The lack of a CVSS score requires an independent severity assessment based on the vulnerability's characteristics. Given that the flaw allows arbitrary file inclusion without authentication or complex user interaction, it poses a significant risk to confidentiality and potentially integrity of the affected systems. Attackers could leverage this vulnerability to read sensitive files, escalate privileges, or chain with other vulnerabilities to execute code.

The primary impact of CVE-2026-22403 is unauthorized disclosure of sensitive information stored on web servers running the vulnerable Innovio theme. Attackers exploiting this vulnerability can read configuration files containing database credentials, API keys, or other secrets, which can lead to further compromise of the web application and backend systems. In some scenarios, LFI vulnerabilities can be escalated to remote code execution if combined with other weaknesses, increasing the threat severity. Organizations relying on Innovio for their websites risk data breaches, loss of customer trust, and potential regulatory penalties if sensitive data is exposed. The vulnerability could also be used to facilitate lateral movement within a network or to implant malicious code, impacting availability and integrity. Since WordPress themes are widely used globally, the scope of affected systems is broad, especially for websites that do not regularly update or audit their themes. The absence of known exploits currently provides a window for mitigation, but the public disclosure increases the risk of future exploitation attempts.

To mitigate CVE-2026-22403, organizations should first check for updates or patches released by Mikado-Themes and apply them promptly once available. In the absence of official patches, administrators should implement strict input validation and sanitization on any parameters used in file inclusion functions to prevent manipulation. Employing Web Application Firewalls (WAFs) with rules targeting LFI attack patterns can help detect and block exploitation attempts. Restricting file system permissions to limit the web server's access to sensitive files reduces the potential impact of successful exploitation. Additionally, disabling PHP functions like include, require, or allowing only whitelisted files for inclusion can mitigate risks. Regular security audits and monitoring of web server logs for suspicious requests related to file inclusion can provide early detection. Finally, educating developers and administrators about secure coding practices and the risks of dynamic file inclusion is essential to prevent similar vulnerabilities.