CVE-2026-22405 identifies a Local File Inclusion (LFI) vulnerability in the Mikado-Themes Overton WordPress theme, specifically versions up to and including 1.3. The vulnerability arises from improper control over the filename parameter used in PHP include or require statements. This flaw allows an attacker to manipulate the input that determines which file is included, bypassing intended restrictions. As a result, an attacker can include arbitrary files from the local filesystem, potentially exposing sensitive configuration files, source code, or other data. In some cases, LFI can be escalated to Remote Code Execution (RCE) if the attacker can upload malicious files or leverage other vulnerabilities. The vulnerability does not require authentication or user interaction, increasing its risk profile. No official patches or fixes are currently linked, and no exploits have been observed in the wild. The vulnerability affects the confidentiality and integrity of affected web servers and can lead to significant compromise of WordPress sites using this theme. The issue was reserved in early 2026 and published in March 2026, indicating recent discovery and disclosure.

The impact of CVE-2026-22405 is substantial for organizations running WordPress sites with the Mikado-Themes Overton theme version 1.3 or earlier. Successful exploitation can lead to unauthorized disclosure of sensitive files such as configuration files containing database credentials, private keys, or other sensitive information. This can facilitate further attacks including privilege escalation, data theft, or full site compromise. The vulnerability undermines the confidentiality and integrity of the affected systems and can disrupt availability if attackers manipulate critical files. Given WordPress's widespread use globally, and the popularity of Mikado-Themes themes among small to medium businesses and bloggers, the scope of affected systems could be significant. Organizations relying on this theme for their web presence face reputational damage, data breaches, and potential regulatory consequences if exploited. The lack of known exploits currently provides a window for mitigation before widespread attacks occur.

1. Immediate mitigation involves updating the Mikado-Themes Overton theme to a version that addresses this vulnerability once available. If no patch is currently released, temporarily disabling or removing the theme is recommended. 2. Implement strict input validation and sanitization on any parameters controlling file inclusion to prevent manipulation. 3. Employ Web Application Firewalls (WAFs) with rules designed to detect and block attempts to exploit LFI vulnerabilities, including suspicious file path traversal patterns. 4. Restrict file permissions on the web server to limit access to sensitive files and directories, minimizing the impact of potential LFI exploitation. 5. Monitor web server logs for unusual requests that attempt to include local files or access sensitive paths. 6. Conduct a thorough security audit of the WordPress environment to identify and remediate any other vulnerabilities that could be chained with this LFI. 7. Educate site administrators on the risks of using outdated themes and the importance of timely updates and security best practices.