What is CVE-2026-87917?

CVE-2026-87917 is a medium-severity vulnerability in Dvankooten Mc4wp: Mailchimp For WordPress, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-09-19.

How severe is CVE-2026-87917?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Dvankooten Mc4wp: Mailchimp For WordPress

CVE-2026-87917

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via 'data' Dynamic Content Tag in all versions up to, and including, 4.14.0 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.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Dvankooten Mc4wp: Mailchimp For Wordpress

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-87917?: CVE-2026-87917 is a medium-severity vulnerability in Dvankooten Mc4wp: Mailchimp For WordPress, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-09-19.
How severe is CVE-2026-87917?: Medium severity. CVSS v3 base score is 6.1 out of 10.