CVE-2026-7047
Summary
by MITRE • 06/06/2026
The Frontend User Notes plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.1.1. This is due to missing or incorrect nonce validation on the funp_ajax_modify_notes function. This makes it possible for unauthenticated attackers to trick a logged-in user into visiting a malicious page, causing unauthorized overwriting of that victim's own note content via a forged cross-site request to wp_update_post() via a forged request granted they can trick a site administrator into performing an action such as clicking on a link. Due to ownership enforcement comparing the note's stored _funp_single_user_id meta against the current session's user ID, the attack is limited to modifying only notes belonging to the tricked victim, and cannot be used to alter notes owned by arbitrary third-party users.
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Analysis
by VulDB Data Team • 06/06/2026
The Frontend User Notes plugin for WordPress presents a critical cross-site request forgery vulnerability that affects all versions up to and including 2.1.1, creating a significant security risk for WordPress installations. This vulnerability stems from inadequate nonce validation within the funp_ajax_modify_notes function, which serves as the primary attack vector for malicious actors seeking to manipulate user note content. The flaw operates under the principle that unauthenticated attackers can craft malicious web pages designed to exploit the trust relationship between authenticated users and the WordPress administration interface. When a logged-in user visits such a crafted page, the malicious request executes without proper authentication verification, potentially leading to unauthorized modifications of user-specific note data.
The technical implementation of this vulnerability involves the absence of proper nonce validation mechanisms that should normally verify the authenticity of AJAX requests made through the funp_ajax_modify_notes endpoint. This oversight allows attackers to construct forged requests that appear legitimate to the WordPress system, bypassing standard security controls that would normally prevent unauthorized modifications. The attack requires minimal user interaction beyond visiting a malicious page, making it particularly dangerous as it leverages the victim's existing authenticated session. The forged requests specifically target the wp_update_post() function, which handles the actual modification of note content within the WordPress database, effectively enabling attackers to overwrite user notes without requiring explicit credentials.
The operational impact of this vulnerability is significant within the context of WordPress security architecture and user trust models. While the attack is limited to modifying notes owned by the specific victim who falls for the deception, this restriction does not diminish the overall threat level considerably. The vulnerability affects the fundamental integrity of user data within the plugin's functionality, potentially leading to information disclosure, data corruption, or manipulation of personal notes that users may consider private or sensitive. The attack's success rate remains high due to the minimal technical sophistication required, as users often visit malicious links without proper security awareness, and the vulnerability exists at the core of the plugin's user interaction flow. This makes it particularly dangerous in environments where administrators or regular users might inadvertently trigger the malicious requests.
The security implications of this vulnerability align with CWE-352, which specifically addresses Cross-Site Request Forgery weaknesses in web applications, and relates to ATT&CK technique T1566.002 for phishing attacks that leverage web-based exploitation. Organizations should implement immediate mitigations including updating to patched versions of the plugin, implementing proper nonce validation, and establishing security monitoring for suspicious AJAX requests. The vulnerability demonstrates how seemingly minor implementation flaws in plugin development can create substantial security risks, highlighting the importance of robust authentication mechanisms and proper input validation in WordPress plugin architecture. Defense in depth strategies should include user education about suspicious links, implementation of content security policies, and regular security audits of third-party plugins to prevent similar vulnerabilities from compromising user data integrity and system security.