CVE-2021-24874: Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue < 3.1.31 - Reflected Cross-Site Scripting

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: 2022-02-14 · updated 2026-06-17
Weakness: CWE-79

Description

The Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue WordPress plugin before 3.1.31 does not escape the lang and pid parameter before outputting them back in attributes, leading to Reflected Cross-Site Scripting issues

Affected products

neeraj_slit Brevo – Email, SMS, Web Push, Chat, and more.: before 3.1.31 — fixed in 3.1.31

How to fix

Upgrade to a fixed version: neeraj_slit Brevo – Email, SMS, Web Push, Chat, and more. 3.1.31. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/28d34cc1-2294-4409-a60f-c8c441eb3f2d
https://wpscan.com/vulnerability/28d34cc1-2294-4409-a60f-c8c441eb3f2d

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