What the vulnerability does
01Description
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.
Explanation of Vulnerability in Simple Terms
02Summary
Frontend User Notes versions 2.1.1 and earlier are vulnerable to cross-site request forgery (CSRF) attacks. An attacker can craft a malicious webpage that, when visited by a logged-in site administrator, performs unwanted actions on their behalf without their knowledge. The vulnerability requires the victim to visit the attacker's page while authenticated to the site.
What an attacker can do
03Attacker Capabilities
Perform unwanted actions on the site by tricking an authenticated admin into visiting a malicious webpage.
Potential impact on your site
04Site Impact
An attacker can modify site content or settings if they trick an admin into clicking a malicious link while logged in.
Conditions required to exploit
05Prerequisites
The site admin must be logged in and visit a page controlled by the attacker.
Key dates
06Disclosure timeline
June 5, 2026
CVE published
June 6, 2026
Record updated
