CVE-2026-84759 in Activity Log Plugin
Summary
by MITRE • 09/02/2026
Unauthenticated Cross Site Request Forgery (CSRF) in Activity Log <= 2.13.1 versions.
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Analysis
by VulDB Data Team • 09/02/2026
The vulnerability identified as an unauthenticated Cross-Site Request Forgery within the Activity Log plugin, specifically affecting versions up to and including 2.13.1, represents a critical security flaw that undermines the integrity of administrative actions through maliciously crafted requests. This type of attack exploits the inherent trust that web applications place in users' browsers, allowing an attacker to trick authenticated administrators into performing unintended actions without their knowledge or consent. Unlike many other CSRF vulnerabilities that require some level of user interaction such as clicking a link, this specific flaw is characterized by its unauthenticated nature regarding the initial exploit vector, meaning the attack can be initiated remotely and automatically without any prior authentication step for the attacker to gain access to the application itself. The core technical issue lies in the absence or insufficiency of anti-CSRF tokens within the form submissions that modify system settings or log configurations. When a user is logged into the WordPress dashboard, their browser retains session cookies which are sent with every request made to the domain. If the server does not validate these requests against a unique, secret token generated per session and embedded in each form, it cannot distinguish between legitimate administrative actions initiated by the user and forged requests crafted by an external malicious site or script.
The operational impact of this vulnerability is severe because Activity Log plugins often handle sensitive security auditing data and configuration settings that dictate how system activities are recorded and monitored. An attacker leveraging this flaw could potentially alter logging configurations to disable specific audit trails, thereby obscuring their own intrusion attempts from future detection by administrators. Furthermore, depending on the specific capabilities exposed through the plugin's administrative interface, an attacker might be able to export sensitive log data containing user credentials or internal system details, modify notification settings to redirect alerts away from security teams, or even delete critical historical logs to cover tracks of previous malicious activities. This not only compromises the confidentiality and integrity of the audit trail but also degrades the availability of accurate security monitoring capabilities for the organization. The unauthenticated aspect amplifies the risk significantly as it lowers the barrier to entry for attackers, allowing them to execute these attacks via simple HTML pages or embedded images hosted on third-party sites, making social engineering vectors like phishing emails highly effective delivery mechanisms where a victim simply loads a malicious page while logged into their WordPress administration panel.
From a classification perspective, this vulnerability aligns with CWE-352, which defines Cross-Site Request Forgery as the inclusion of untrusted data in web requests without proper validation or verification of intent. It also maps to MITRE ATT&CK technique T1078, specifically Valid Accounts, where attackers leverage existing valid credentials obtained through other means to perform actions within a system. The lack of synchronization tokens is a classic implementation error that violates the principle of same-origin policy enforcement at the application logic level rather than just the browser security model level. To mitigate this risk effectively, developers must implement robust anti-CSRF mechanisms such as synchronizer tokens or double-submit cookies for all state-changing operations within the plugin's administrative interface. These tokens should be unique per session and validated server-side before any action is executed. Additionally, implementing strict Content Security Policy headers can help restrict the sources from which scripts are loaded, reducing the attack surface for automated CSRF exploits. For administrators using affected versions, immediate upgrading to a patched version that includes these security controls is essential. In the interim, restricting access to the WordPress admin area via IP whitelisting and ensuring strong session management practices can provide some layer of defense against exploitation until the software update is applied.