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CVE-2024-35668: WordPress Newsletter, SMTP, Email marketing and Subscribe forms by Brevo plugin <= 3.1.77 - Reflected Cross Site Scripting (XSS) vulnerability

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-06-04 · updated 2026-06-17
• Weakness: CWE-79

Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Brevo Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue allows Reflected XSS.This issue affects Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue: from n/a through 3.1.77.

Affected products

• neeraj_slit Brevo – Email, SMS, Web Push, Chat, and more.: before 3.1.78 — fixed in 3.1.78

How to fix

Upgrade to a fixed version: neeraj_slit Brevo – Email, SMS, Web Push, Chat, and more. 3.1.78. Check the vendor advisory for mitigations.

References

• https://patchstack.com/database/vulnerability/mailin/wordpress-newsletter-smtp-email-marketing-and-subscribe-forms-by-brevo-plugin-3-1-77-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve
• https://patchstack.com/database/vulnerability/mailin/wordpress-newsletter-smtp-email-marketing-and-subscribe-forms-by-brevo-plugin-3-1-77-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve

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