CVE-2026-25458: Moments Theme File Inclusion Vulnerability

CVE-2026-25458 Overview

CVE-2026-25458 is a PHP Local File Inclusion (LFI) vulnerability affecting the Select-Themes Moments WordPress theme. The vulnerability stems from improper control of filename parameters used in PHP include/require statements, allowing attackers to include arbitrary local files on the server. This can lead to sensitive information disclosure, configuration file exposure, and potentially remote code execution through log poisoning or other advanced techniques.

Critical Impact

Attackers can exploit this LFI vulnerability to read sensitive files from the server, including WordPress configuration files containing database credentials, potentially leading to full site compromise.

Affected Products

• Select-Themes Moments WordPress Theme version 2.2 and earlier
• All WordPress installations running vulnerable versions of the Moments theme

Discovery Timeline

• 2026-03-25 - CVE CVE-2026-25458 published to NVD
• 2026-03-26 - Last updated in NVD database

Technical Details for CVE-2026-25458

Vulnerability Analysis

This vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The Moments WordPress theme fails to properly validate and sanitize user-supplied input before passing it to PHP's include or require functions. This allows an attacker to manipulate file path parameters to include arbitrary local files from the server's filesystem.

The network-accessible nature of this vulnerability means attackers can exploit it remotely without requiring any prior authentication or user interaction. While the attack complexity is considered high, successful exploitation could result in significant confidentiality, integrity, and availability impacts to the affected WordPress installation.

Root Cause

The root cause lies in insufficient input validation within the theme's PHP code. When the application accepts user-controlled input to construct file paths for include/require statements without proper sanitization, attackers can use directory traversal sequences (such as ../) to escape the intended directory and access files elsewhere on the filesystem.

Attack Vector

The vulnerability is exploited over the network, typically through crafted HTTP requests to the WordPress installation. An attacker can manipulate URL parameters or POST data to inject malicious file paths. Common targets include:

• /etc/passwd for user enumeration on Linux systems
• wp-config.php for database credentials
• Log files for potential log poisoning attacks
• Other sensitive configuration files

The attack does not require authentication, making any publicly accessible WordPress site running the vulnerable Moments theme a potential target. The exploitation technique typically involves using path traversal sequences combined with null byte injection (on older PHP versions) or wrapper techniques to read or include sensitive files.

Detection Methods for CVE-2026-25458

Indicators of Compromise

• Unusual HTTP requests containing path traversal sequences such as ../, ..%2f, or ....//
• Access attempts targeting sensitive system files like /etc/passwd, /etc/shadow, or wp-config.php
• Web server access logs showing requests with encoded directory traversal patterns
• Unexpected PHP errors or warnings related to file inclusion failures

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in request parameters
• Monitor web server logs for suspicious file inclusion attempts using pattern matching for common LFI indicators
• Deploy SentinelOne Singularity for real-time endpoint detection of file access anomalies
• Enable PHP error logging and monitor for failed include/require operations

Monitoring Recommendations

• Configure alerting for any requests containing directory traversal sequences targeting WordPress theme directories
• Monitor file access patterns on the web server for reads of sensitive configuration files
• Implement log aggregation and analysis to correlate potential LFI exploitation attempts across multiple requests
• Review WordPress admin activity logs for signs of post-exploitation activities

How to Mitigate CVE-2026-25458

Immediate Actions Required

• Update the Select-Themes Moments theme to a patched version if available
• If no patch is available, consider temporarily disabling or replacing the Moments theme
• Implement WAF rules to block LFI attack patterns as an interim measure
• Restrict file permissions on sensitive configuration files to limit exposure

Patch Information

The vulnerability affects Select-Themes Moments WordPress theme versions through 2.2. Users should check the Patchstack WordPress Vulnerability Report for the latest patch status and remediation guidance. Contact the theme vendor Select-Themes directly for information about security updates.

Workarounds

• Implement server-side input validation to reject requests containing path traversal sequences
• Use PHP's basename() function or similar sanitization on any user input used in file operations
• Configure PHP open_basedir to restrict file access to the WordPress installation directory
• Deploy a Web Application Firewall with rules specifically targeting LFI attack patterns

The mitigation approach focuses on implementing proper input validation at the application level. Server administrators should ensure that any user-controlled input used in file path construction is properly sanitized using allowlist validation or path canonicalization techniques. Additionally, hardening the PHP environment through open_basedir restrictions and disabling dangerous functions can limit the impact of successful exploitation.