What the vulnerability does
01Description
The Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue) plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the page parameter in all versions up to, and including, 3.1.77 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
Explanation of Vulnerability in Simple Terms
02Summary
The Brevo plugin contains a cross-site scripting (XSS) vulnerability in versions up to 3.1.77. An attacker can inject malicious scripts that execute in a victim's browser when they visit a crafted link or page. The vulnerability requires user interaction and affects the integrity and confidentiality of site data. Update to a version newer than 3.1.77 to remediate.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that run in a victim's browser, potentially stealing session data or modifying page content.
Potential impact on your site
04Site Impact
Site visitors could have their sessions hijacked or see altered content; trust in your site may be compromised.
Conditions required to exploit
05Prerequisites
Victim must click a malicious link or visit an attacker-controlled page; no authentication required.
Key dates
06Disclosure timeline
July 10, 2026
CVE published
