CVE-2024-4355 in Block Bad Bots and Stop Bad Bots Crawlers and Spiders and Anti Spam Protection Plugin
Summary
by MITRE • 05/30/2024
The Block Bad Bots and Stop Bad Bots Crawlers and Spiders and Anti Spam Protection plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the stopbadbots_get_ajax_data() function in all versions up to, and including, 10.24. This makes it possible for authenticated attackers, with subscriber-level access and above, to expose visitor data.
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Analysis
by VulDB Data Team • 08/18/2026
The vulnerability identified within the Block Bad Bots and Stop Bad Bots Crawlers and Spiders and Anti Spam Protection plugin for WordPress represents a critical failure in authorization logic that allows authenticated users to access sensitive information beyond their intended privileges. Specifically, this flaw resides in the stopbadbots_get_ajax_data() function, which is present in all versions of the plugin up through version 10.24. The core technical issue stems from a missing capability check during the execution of this AJAX endpoint. In secure WordPress development practices, any administrative or data-processing action triggered via an AJAX request must verify that the initiating user possesses specific capabilities defined by the platform's role system before proceeding with sensitive operations. By omitting this verification step, the plugin fails to enforce proper access control boundaries, effectively bypassing the security model designed to restrict data visibility based on user roles.
From a technical perspective, this vulnerability is classified under CWE-284, which denotes Improper Access Control. The absence of an explicit check for capabilities such as manage_options or other administrative privileges means that any authenticated account with subscriber-level access and above can invoke the function directly. This includes low-privilege accounts like subscribers, who typically have minimal permissions within a WordPress environment. When these users trigger the AJAX request, they are able to retrieve data intended only for higher-privileged administrators or security analysts monitoring bot activity. The exploitation of this flaw does not require complex injection techniques or authentication bypasses; it relies solely on the misconfiguration of server-side authorization checks, making it relatively straightforward for an attacker with valid credentials to exploit.
The operational impact of this vulnerability centers on the unauthorized exposure of visitor data and potentially sensitive security logs maintained by the plugin. Since the function is designed to retrieve information related to blocked bots, crawlers, and spam attempts, accessing this endpoint allows attackers to view details about website visitors who have been flagged or blocked. This could include IP addresses, user agent strings, timestamps, and other metadata associated with these interactions. Such exposure violates privacy expectations and may lead to compliance issues if the data contains personally identifiable information subject to regulations like GDPR or CCPA. Furthermore, for security professionals relying on this plugin as part of their defense-in-depth strategy, the leakage of bot-blocking logs undermines trust in the tool's ability to protect site integrity without compromising user privacy.
This vulnerability aligns with several tactics and techniques within the MITRE ATT&CK framework, particularly those related to Collection and Discovery. The unauthorized retrieval of data corresponds to Data from Information Repositories or potentially Unsecured Credentials if sensitive login attempts are logged alongside bot activity. It also reflects Improper Privilege Management, a common weakness in web applications where role-based access control is not strictly enforced on all endpoints. Attackers with low-level access can leverage this flaw to gather intelligence about the site's security posture and visitor patterns without triggering high-alert administrative actions that might draw immediate attention from system administrators.
To mitigate this vulnerability, it is imperative for users of the Block Bad Bots plugin to update immediately to a version newer than 10.24, where the capability check has presumably been implemented in the stopbadbots_get_ajax_data() function. Until an official patch is available or if updating is not feasible due to compatibility constraints with other site plugins, administrators should consider disabling AJAX access for this specific endpoint through server-level configuration rules or by restricting plugin functionality via alternative security measures such as Web Application Firewalls that can filter out unauthorized requests based on user roles. Additionally, enforcing strict password policies and multi-factor authentication reduces the risk of credential compromise, which is a prerequisite for exploiting any authenticated vulnerability like this one. Regular auditing of installed plugins and their permissions against current WordPress coding standards will help prevent similar authorization flaws in future deployments.