CVE-2026-27536 HIGH

CVE-2026-27536: WordPress MailChimp Subscribe Forms plugin <= 4.3.3 - Cross Site Scripting (XSS) vulnerability

Vendor Pluginops
Product MailChimp Subscribe Forms
Weakness CWE-79 · XSS
Published August 13, 2026
Last update August 13, 2026
View on NVD All CVEs

CVSS base score

7.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

What the vulnerability does

01Description

Unauthenticated Cross Site Scripting (XSS) in MailChimp Subscribe Forms <= 4.3.3 versions.

Explanation of Vulnerability in Simple Terms

02Summary

MailChimp Subscribe Forms versions up to 4.3.3 contain a cross-site scripting (XSS) vulnerability that allows attackers to inject malicious scripts into web pages viewed by site visitors. The vulnerability requires user interaction—typically clicking a malicious link—and can affect multiple users across the site. An attacker can steal session cookies, redirect visitors, or deface content.

What an attacker can do

03Attacker Capabilities

Inject malicious JavaScript that runs in visitors' browsers to steal data, redirect users, or deface the site.

Potential impact on your site

04Site Impact

Visitors may be redirected to phishing sites, have sessions hijacked, or see altered page content without your knowledge.

Conditions required to exploit

05Prerequisites

No authentication required. Attacker must trick a site visitor into clicking a malicious link or visiting a crafted page.

Key dates

06Disclosure timeline

August 13, 2026 CVE published

Related vulnerabilities

08Related CVE

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