Reflected Cross-Site Scripting Vulnerability Patched in Yoast SEO WordPress Plugin

On April 22th, 2024, during the second Wordfence Bug Bounty Extravaganza a submission was received for a Reflected Cross-Site Scripting (XSS) vulnerability in Yoast SEO, a WordPress plugin with more than 5 million active installations. This vulnerability makes it possible for an unauthenticated attacker to craft a request that contains malicious JavaScript. If the attacker is able to trick a site administrator into performing an action, the malicious JavaScript executes, making it possible for the attacker to create new admin users, redirect victims, or engage in other harmful attacks.

Props to Bassem Essam who discovered and responsibly reported this vulnerability through the Wordfence Bug Bounty Program. This researcher earned a bounty of $563.00 for this discovery during our Bug Bounty Program Extravaganza.

All Wordfence users are protected against any exploits targeting this vulnerability by the Wordfence firewall’s built-in Cross-Site Scripting protection.

Wordfence contacted the Yoast team on April 23, 2024, and received a response on the same day. After providing full disclosure details, the developer released a patch on April 30, 2024. We would like to commend the Yoast team for their prompt response and timely patch.

We urge users to update their sites with the latest patched version of Yoast SEO, which is version 22.6, as soon as possible.

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Posted in Vulnerability.