CVE-2025-52810: Katerio Magazine Path Traversal Flaw

CVE-2025-52810 Overview

CVE-2025-52810 is a Path Traversal vulnerability in the TMRW-studio Katerio - Magazine WordPress theme that enables PHP Local File Inclusion (LFI). The flaw affects all versions of the theme from initial release through version 1.5.1. Attackers can exploit the issue over the network without authentication, although successful exploitation requires meeting specific conditions reflected in the high attack complexity rating. Successful exploitation impacts confidentiality, integrity, and availability of the affected WordPress site.

Critical Impact

Unauthenticated network attackers can include arbitrary local PHP files on the WordPress host, leading to sensitive information disclosure and potential remote code execution.

Affected Products

• TMRW-studio Katerio - Magazine WordPress theme
• All versions from initial release through 1.5.1
• WordPress sites running the vulnerable theme

Discovery Timeline

• 2025-06-27 - CVE-2025-52810 published to NVD
• 2026-04-28 - Last updated in NVD database

Technical Details for CVE-2025-52810

Vulnerability Analysis

The vulnerability is classified under [CWE-35] (Path Traversal: '.../...//'), a weakness where user-supplied input is used to construct file paths without sufficient sanitization. In the Katerio - Magazine theme, attacker-controlled input reaches a PHP file inclusion function (such as include, include_once, require, or require_once) on the server. By submitting traversal sequences, an attacker can escape the intended directory and reference PHP files elsewhere on the filesystem.

Because PHP executes any included file as code, an LFI primitive often escalates beyond information disclosure. Attackers can read configuration files such as wp-config.php to extract database credentials, secret keys, and authentication salts. If the attacker can write content to a known location on disk through log poisoning, uploaded media, or session files, the inclusion becomes remote code execution under the web server account.

Root Cause

The root cause is improper neutralization of path traversal sequences (../, ..\\, encoded variants) within a parameter that the theme passes to a PHP file inclusion call. The theme does not normalize the resolved path, restrict inclusions to an allowlist of expected templates, or validate the file extension and base directory before loading the target.

Attack Vector

The attack is conducted over the network against a WordPress endpoint exposed by the theme. No authentication or user interaction is required. An attacker issues an HTTP request containing traversal sequences in the vulnerable parameter. The server resolves the path outside the intended template directory and includes the targeted PHP file. The high attack complexity reflects conditions such as required knowledge of the target filesystem layout or specific configuration prerequisites for full code execution.

No verified public proof-of-concept code is referenced in the advisory. Technical details are tracked in the Patchstack Vulnerability Database Entry.

Detection Methods for CVE-2025-52810

Indicators of Compromise

• HTTP request parameters containing ../, ..%2f, %2e%2e%2f, or ....// sequences targeting theme endpoints under /wp-content/themes/katerio/.
• Web server access logs showing inclusion attempts referencing sensitive files such as wp-config.php, /etc/passwd, or PHP session files.
• Unexpected PHP errors in logs referencing include() or require() with paths outside the theme directory.
• New or modified PHP files in upload directories that coincide with suspicious request patterns.

Detection Strategies

• Inspect web access logs for requests to Katerio theme files carrying parameters with directory traversal patterns or URL-encoded equivalents.
• Deploy a web application firewall rule that blocks traversal sequences targeting WordPress theme parameters.
• Correlate inbound HTTP requests with subsequent outbound connections from the PHP-FPM or web server process to identify post-inclusion command-and-control activity.

Monitoring Recommendations

• Enable PHP error logging and alert on failed to open stream messages originating from theme files.
• Monitor file integrity for wp-config.php, theme directories, and upload paths.
• Track HTTP 200 responses to requests containing traversal payloads, which often indicate successful inclusion.

How to Mitigate CVE-2025-52810

Immediate Actions Required

• Identify all WordPress installations running the Katerio - Magazine theme at version 1.5.1 or earlier.
• Deploy a vendor-supplied patched release as soon as it is available from TMRW-studio.
• Place a WAF rule in front of affected sites to block traversal sequences in query strings and POST bodies until patching is complete.
• Rotate WordPress secret keys, salts, and database credentials if any inclusion attempts succeeded.

Patch Information

The Patchstack advisory tracks remediation status for this vulnerability. Review the Patchstack Vulnerability Database Entry for the latest fixed version and upgrade guidance from TMRW-studio. Update the theme through the WordPress admin console or by replacing the theme directory with the patched release.

Workarounds

• Disable or remove the Katerio - Magazine theme on sites that cannot be patched promptly.
• Restrict access to WordPress theme endpoints with authentication or IP allowlists at the reverse proxy.
• Set open_basedir in PHP configuration to limit file inclusion to the WordPress installation directory.
• Configure the web application firewall to deny requests containing ../, encoded traversal sequences, or php:// wrappers.

# Configuration example: restrict PHP file access scope via open_basedir
# Add to php.ini or site-specific PHP-FPM pool configuration
open_basedir = "/var/www/html/:/tmp/"
disable_functions = "exec,passthru,shell_exec,system,proc_open,popen"
allow_url_include = Off
allow_url_fopen = Off