CVE-2026-1257 is a Local File Inclusion vulnerability classified under CWE-98, found in the 'Administrative Shortcodes' WordPress plugin developed by shazdeh. The vulnerability exists in all versions up to and including 0.3.4 due to insufficient sanitization and validation of the 'slug' attribute passed to the get_template_part() function within the 'get_template' shortcode. This flaw allows authenticated users with Contributor-level permissions or higher to manipulate the file path parameter, enabling them to include arbitrary files from the server. Because WordPress allows users with Contributor roles to upload certain file types (e.g., images), attackers can upload PHP code disguised as safe files and then include and execute them via this vulnerability. The impact includes the ability to execute arbitrary PHP code on the server, bypass WordPress access controls, and potentially exfiltrate sensitive data or take full control of the affected server. The vulnerability requires network access and authenticated user privileges but does not require user interaction beyond authentication. The CVSS v3.1 base score is 7.5, reflecting high severity with network attack vector, high impact on confidentiality, integrity, and availability, and a requirement for low privileges. No public exploits have been reported yet, but the vulnerability's nature and ease of exploitation by authenticated users make it a significant risk for affected sites.

The vulnerability allows attackers with Contributor-level access or higher to execute arbitrary PHP code on the web server hosting the vulnerable WordPress plugin. This can lead to full server compromise, including unauthorized access to sensitive data, modification or deletion of content, and disruption of service. Since Contributors typically have limited permissions, this vulnerability effectively escalates their privileges to remote code execution, bypassing normal WordPress access controls. Organizations running websites with this plugin are at risk of data breaches, defacement, malware deployment, and potential lateral movement within their network. The impact is especially critical for high-traffic or business-critical WordPress sites, where downtime or data loss can cause significant operational and reputational damage.

1. Immediately update the 'Administrative Shortcodes' plugin to a version that patches this vulnerability once available. 2. If a patch is not yet released, restrict Contributor-level user permissions temporarily or disable the plugin until a fix is applied. 3. Implement strict input validation and sanitization on user-supplied parameters, especially those used in file inclusion functions. 4. Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious requests attempting to exploit the 'slug' parameter. 5. Monitor logs for unusual file inclusion attempts or unexpected file uploads that could indicate exploitation attempts. 6. Limit file upload types and scan uploaded files for malicious content to prevent uploading executable code disguised as images or other safe files. 7. Conduct regular security audits and penetration tests focusing on user privilege escalation and file inclusion vulnerabilities. 8. Harden the server environment by disabling unnecessary PHP functions and restricting file system permissions to limit the impact of potential code execution.