CVE-2021-24923: Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue < 3.1.25 - Reflected XSS

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-01-24 · updated 2026-06-17
Weakness: CWE-79

Description

The Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue WordPress plugin before 3.1.25 does not escape the sib-statistics-date parameter before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting issue

Affected products

neeraj_slit Brevo – Email, SMS, Web Push, Chat, and more.: before 3.1.25 — fixed in 3.1.25

How to fix

Upgrade to a fixed version: neeraj_slit Brevo – Email, SMS, Web Push, Chat, and more. 3.1.25. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/3afef591-9e00-4af8-a8a6-e04ec5e61795
https://wpscan.com/vulnerability/3afef591-9e00-4af8-a8a6-e04ec5e61795

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