The Alex User Counter plugin for WordPress, developed by adzbierajewski, suffers from a Cross-Site Request Forgery (CSRF) vulnerability identified as CVE-2026-1070. This vulnerability exists in all versions up to and including 6.0 due to the absence of nonce validation in the alex_user_counter_function(), which handles plugin settings updates. Nonce validation is a security mechanism in WordPress that protects against CSRF by ensuring that requests originate from legitimate users and not from malicious third-party sites. Without this protection, an attacker can craft a malicious link or webpage that, when visited by a logged-in WordPress administrator, causes the plugin settings to be altered without the administrator's consent. The attack does not require the attacker to be authenticated but does require the administrator to perform an action such as clicking a link, making it a user interaction-based attack. The vulnerability impacts the integrity of the plugin's configuration but does not compromise confidentiality or availability. The CVSS 3.1 base score is 4.3, reflecting a medium severity level with an attack vector of network, low attack complexity, no privileges required, and user interaction needed. No public exploits have been reported, and no patches are currently linked, indicating that mitigation may require manual code updates or waiting for an official patch. This vulnerability is categorized under CWE-352, which covers CSRF issues. Given the widespread use of WordPress and the popularity of plugins for site functionality, this vulnerability poses a risk to many websites, especially those managed by less security-aware administrators.

The primary impact of CVE-2026-1070 is unauthorized modification of plugin settings, which can lead to misconfiguration, potential exposure of site metrics, or enabling further attacks if the plugin's settings influence site behavior or security controls. While it does not directly expose sensitive data or cause denial of service, the integrity compromise can be leveraged by attackers to weaken site defenses or prepare for more severe attacks. Organizations relying on the Alex User Counter plugin risk having their site metrics or user counters manipulated, which could affect business analytics or user experience. Additionally, attackers might use the altered settings as a foothold for subsequent attacks, such as injecting malicious scripts or redirecting users. The requirement for administrator interaction limits the attack scope but does not eliminate risk, especially in environments where administrators frequently access external links or emails. The medium CVSS score reflects moderate risk, but the widespread deployment of WordPress sites globally increases the potential impact. Without mitigation, organizations face ongoing risk of stealthy configuration changes that could degrade site trustworthiness and operational integrity.

To mitigate this vulnerability, site administrators and developers should implement nonce validation in the alex_user_counter_function() to ensure that all requests modifying plugin settings are verified as legitimate and originate from authorized users. This involves adding WordPress nonce checks using functions like wp_verify_nonce() before processing any state-changing requests. Until an official patch is released, manual code review and modification of the plugin source code to include nonce validation is recommended. Administrators should also educate users to avoid clicking suspicious links, especially when logged into WordPress admin panels. Employing web application firewalls (WAFs) with CSRF protection rules can help detect and block forged requests. Regularly monitoring plugin updates and applying patches promptly once available is critical. Additionally, limiting administrator access and enforcing multi-factor authentication reduces the risk of successful exploitation. Backup procedures should be in place to restore plugin settings if unauthorized changes occur. Finally, security teams should audit plugin usage and consider alternative plugins with better security track records if timely patches are not forthcoming.