CVE-2025-53247: BlogMarks Path Traversal Vulnerability

CVE-2025-53247 Overview

CVE-2025-53247 is a PHP Local File Inclusion (LFI) vulnerability in the wpinterface BlogMarks WordPress theme. The flaw stems from improper control of the filename used in PHP include or require statements [CWE-98]. Attackers can manipulate file path parameters to load arbitrary local PHP files within the web server's accessible paths. The vulnerability affects BlogMarks versions up to and including 1.0.8. Successful exploitation can lead to disclosure of sensitive files, execution of attacker-controlled PHP content, and full compromise of the WordPress site.

Critical Impact

Remote, unauthenticated attackers can include arbitrary local PHP files, leading to code execution and complete site compromise.

Affected Products

• wpinterface BlogMarks WordPress Theme — all versions up to and including 1.0.8
• WordPress installations using the BlogMarks theme
• Sites that have not applied the vendor-published patched release

Discovery Timeline

• 2025-08-28 - CVE-2025-53247 published to the National Vulnerability Database (NVD)
• 2026-04-23 - Entry last updated in NVD

Technical Details for CVE-2025-53247

Vulnerability Analysis

The BlogMarks theme passes user-controllable input into a PHP include or require statement without enforcing a strict allowlist or sanitization. This pattern, classified under [CWE-98], allows an attacker to influence which file the PHP interpreter loads at runtime. Because PHP executes the included file in the context of the calling script, any local PHP file the web server can read becomes executable through the vulnerable entry point. The issue is reachable over the network without authentication, though successful exploitation requires the attacker to identify a viable file path on the target system.

Root Cause

The root cause is unsanitized file path input flowing into a dynamic include/require call. The theme does not validate the parameter against an allowlist of expected templates or restrict path resolution to a fixed directory. Path traversal sequences and absolute paths are not stripped, which expands the set of reachable files.

Attack Vector

An unauthenticated remote attacker sends a crafted HTTP request to a BlogMarks endpoint that passes a parameter into a PHP include. By supplying a path that resolves to a local PHP file, including uploaded content or log files containing PHP payloads, the attacker triggers execution of arbitrary code. The vulnerability has higher attack complexity, reflecting the need to identify a usable local file path during exploitation.

For technical specifics, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-53247

Indicators of Compromise

• HTTP requests to BlogMarks theme endpoints containing path traversal patterns such as ../, ..%2f, or php:// wrappers
• Web server logs showing parameter values resolving to system paths like /etc/passwd, wp-config.php, or upload directories with .php extensions
• Unexpected PHP processes spawning child processes such as sh, bash, curl, or wget
• Newly created PHP files in wp-content/uploads/ or other writable theme directories

Detection Strategies

• Inspect WordPress access logs for theme requests containing suspicious file path parameters or traversal sequences
• Deploy a Web Application Firewall (WAF) rule that blocks include/require-style payloads targeting theme files
• Monitor file integrity on the WordPress installation to detect new or modified PHP files in theme and upload directories
• Correlate authentication-less HTTP requests with subsequent outbound network connections from the web server

Monitoring Recommendations

• Aggregate web server, PHP-FPM, and WordPress logs in a centralized analytics platform for cross-source correlation
• Alert on PHP processes reading sensitive files such as wp-config.php, /etc/passwd, or SSH keys
• Track outbound connections initiated by the web server process to detect post-exploitation activity

How to Mitigate CVE-2025-53247

Immediate Actions Required

• Identify all WordPress installations running the BlogMarks theme at version 1.0.8 or earlier
• Disable or remove the BlogMarks theme until a patched version is installed
• Review web server logs for indicators of past exploitation attempts targeting theme files
• Rotate WordPress secrets in wp-config.php and any credentials accessible to the web server if exploitation is suspected

Patch Information

At the time of writing, the Patchstack advisory lists all versions through 1.0.8 as affected. Administrators should apply any vendor-released update beyond 1.0.8 or migrate to an actively maintained theme if no fix is available.

Workarounds

• Restrict access to BlogMarks theme PHP files at the web server or WAF layer until a patch is applied
• Configure PHP open_basedir to limit which directories the interpreter can include or require
• Set allow_url_include=Off and allow_url_fopen=Off in php.ini to prevent remote inclusion variants
• Apply least-privilege filesystem permissions so the web server cannot read sensitive configuration files outside the WordPress root

# Example PHP hardening in php.ini
allow_url_include = Off
allow_url_fopen = Off
open_basedir = "/var/www/html:/tmp"
disable_functions = "exec,passthru,shell_exec,system,proc_open,popen"