CVE-2025-8151 is a path traversal vulnerability classified under CWE-22 found in the HT Mega – Absolute Addons For Elementor plugin for WordPress, affecting all versions up to and including 2.9.1. The vulnerability exists in the 'save_block_css' function, which fails to properly sanitize or restrict pathname inputs. This flaw allows authenticated attackers with Author-level or higher privileges to traverse directories and manipulate CSS files outside the intended plugin directory. Specifically, on Windows environments, attackers can create or delete CSS files in arbitrary directories, potentially altering site appearance or injecting malicious stylesheets. The vulnerability does not impact confidentiality or availability directly but compromises integrity by enabling unauthorized file modifications. Exploitation requires network access and authenticated user privileges but no user interaction. The CVSS 3.1 base score is 4.3, reflecting medium severity due to the limited scope and required privileges. No patches or exploits are currently publicly available, but the vulnerability is published and should be addressed promptly. This issue highlights the risks of insufficient input validation in WordPress plugins, especially those handling file operations.

The primary impact of CVE-2025-8151 is on the integrity of affected WordPress sites using the HT Mega plugin. Attackers with Author-level access can create or delete CSS files arbitrarily, potentially defacing websites, injecting malicious styles, or disrupting site appearance. While confidentiality and availability are not directly compromised, unauthorized file manipulation can lead to reputational damage, loss of user trust, and indirect availability issues if site rendering is broken. The requirement for authenticated access limits exploitation to compromised or insider accounts, reducing the attack surface but still posing a significant risk in environments with multiple contributors or weak access controls. Organizations relying on this plugin in Windows hosting environments are particularly vulnerable due to the ability to affect arbitrary directories. The lack of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits once the vulnerability is widely known.

1. Immediately restrict Author-level and higher privileges to trusted users only, minimizing the risk of exploitation. 2. Monitor and audit user activity for suspicious behavior related to CSS file creation or deletion. 3. Implement file system monitoring on Windows servers hosting WordPress sites to detect unauthorized changes in CSS or other critical directories. 4. Apply principle of least privilege to WordPress roles and plugin permissions to limit access to the vulnerable function. 5. Disable or remove the HT Mega – Absolute Addons For Elementor plugin if it is not essential until a security patch is released. 6. Follow vendor advisories closely and apply official patches or updates as soon as they become available. 7. Consider using Web Application Firewalls (WAFs) with custom rules to detect and block path traversal attempts targeting the 'save_block_css' function. 8. Conduct regular security assessments and penetration tests focusing on plugin vulnerabilities and file system access controls.