Brevo – Email, SMS, Web Push, Chat, and more: Cross-site scripting
Brevo – Email, SMS, Web Push, Chat, and more is affected by cross-site scripting. The vulnerable path is reachable without authentication. Injected script can execute in the affected site's origin when the vulnerable output is viewed. The published affected range is <= 3.1.77.
- Component
- Brevo – Email, SMS, Web Push, Chat, and more.
- Plugin slug
mailin- Affected
- <= 3.1.77
- Safe version
> 3.1.77- Published
- Jul 10, 2026
This CVE was published Jul 10, 2026 and is one of 4 known issues for this plugin.
Update, patch or deactivate.
Update Brevo – Email, SMS, Web Push, Chat, and more to a release after 3.1.77, or disable and remove it until a fixed version is available.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
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.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N