CVE-2026-4123 in RW Elephant Rental Inventory Plugin
Summary
by MITRE • 09/22/2026
The RW Elephant Rental Inventory plugin for WordPress is vulnerable to Missing Authorization in all versions up to and including 2.3.13. This is due to a missing capability check on the toggle_cache() function which is hooked to the wp_ajax_toggle_cache AJAX action. The function also lacks nonce verification. This makes it possible for authenticated attackers, with Subscriber-level access and above, to toggle the plugin's cache setting on or off by sending a POST request to admin-ajax.
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Analysis
by VulDB Data Team • 09/22/2026
The RW Elephant Rental Inventory plugin for WordPress contains a critical security flaw classified as Missing Authorization within all versions up to and including 2.3.13. This vulnerability stems from an insufficient access control mechanism embedded in the plugin's administrative functionality, specifically affecting the toggle_cache() function. The core issue lies in the absence of proper capability checks when handling requests associated with the wp_ajax_toggle_cache AJAX action. In a secure WordPress environment, any operation that modifies system state or configuration must verify that the requesting user possesses the necessary permissions to perform such actions. By failing to implement these checks, the plugin inadvertently exposes sensitive administrative controls to users who should not have access to them.
From a technical perspective, the vulnerability is exacerbated by the lack of nonce verification on the affected endpoint. Nonces are unique tokens used in WordPress to prevent Cross-Site Request Forgery attacks and ensure that requests originate from legitimate sources within the application context. The combination of missing authorization checks and absent noncerification creates a dual failure point. An attacker can bypass both layers of defense by crafting a simple POST request to the admin-ajax.php endpoint with the appropriate action parameter, effectively tricking the server into executing administrative logic without validating the user's role or the integrity of the request source.
The operational impact of this vulnerability is significant for any WordPress site running the affected plugin version. While the requirement for authentication limits the attack surface compared to unauthenticated vulnerabilities, it still poses a serious risk because Subscriber-level access and above are relatively common roles assigned to various users on multi-author sites or membership-based platforms. An authenticated attacker with even minimal privileges can toggle the cache setting of the rental inventory system. This action could lead to service degradation by disabling caching mechanisms intended for performance optimization, potentially causing increased server load and slower response times during high-traffic periods. Furthermore, if the cache state influences other security-related behaviors or data visibility settings within the plugin's logic, an attacker might be able to manipulate these states to expose sensitive rental data or disrupt business operations indirectly through resource exhaustion.
This vulnerability aligns with CWE-285, which describes Improper Authorization, where a software product does not properly verify that the user has sufficient privileges for a given action. Additionally, it relates to CWE-354 regarding the lack of validation for CSRF tokens in forms and AJAX requests. In terms of offensive security frameworks, this flaw facilitates actions consistent with MITRE ATT&CK technique T1078, specifically Valid Accounts, where an attacker uses legitimate credentials to gain access and perform unauthorized administrative tasks within a system. The ability to modify configuration settings via authenticated but low-privilege accounts represents a classic privilege escalation vector in web application security.
To mitigate this vulnerability, immediate action is required by updating the RW Elephant Rental Inventory plugin to version 2.3.14 or later, where these authorization and nonce checks have been properly implemented. For organizations unable to update immediately due to compatibility constraints, temporary mitigation strategies should be employed. These include restricting access to the wp-admin directory using IP whitelisting if feasible, implementing a Web Application Firewall rule that monitors for suspicious POST requests targeting admin-ajax.php with specific action parameters associated with this plugin, and ensuring that user roles are assigned according to the principle of least privilege. Regular security audits and code reviews focusing on AJAX handlers in WordPress plugins can help identify similar authorization gaps before they are exploited in production environments.