Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue <= 3.1.30 - Reflected Cross-Site Scripting via lang & pid Parameters
Strategic Overview
- Status
- Patched in 3.1.31
- Affected Plugin
- Brevo – Email, SMS, Web Push, Chat, and more.
- Affected Version
< 3.1.31- CVSS
- 6.1Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2021-24874
At a glance
CVE-2021-24874 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Brevo WordPress plugin, affecting versions < 3.1.31. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 3.1.31; sites on affected versions should update now. Disclosed January 2022, reported by ZhongFu Su.
Vulnerability Overview
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
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Reaching this weakness in Brevo < 3.1.31 takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Brevo the fix is 3.1.31: builds < 3.1.31 are affected, anything from 3.1.31 onward is not.
Remediation
Update to version 3.1.31, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to Brevo: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Brevo 3.1.31 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in Brevo – Email, SMS, Web Push, Chat, and more.
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