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CVE-2026-15052— MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder <= 4.3.3 - Unauthenticated Stored Cross-Site Scripting via Form Field Values

Quick assessment

Affected
umarbajwa MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder是WordPress基金会开源的一款构建订阅表单与弹出窗口的网站组件。 WordPress MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder 4.3.3及之前版本存在跨站脚本漏洞，该漏洞源于对表单字段值的输入清理和输出转义不足，可能导致未授权攻击者注入任意Web脚本

CVSS 7.2 · High EPSS 0.42% · P34

Affected Version Matrix 1

VendorProduct Version RangeStatus
umarbajwa MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder ≤ 4.3.3 affected
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I. Basic Information for CVE-2026-15052

Vulnerability Information
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Vulnerability Title
MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder <= 4.3.3 - Unauthenticated Stored Cross-Site Scripting via Form Field Values
Source: CVE Program / CVE List V5
Vulnerability Description
The MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Form Field Values in all versions up to, and including, 4.3.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder是WordPress基金会开源的一款构建订阅表单与弹出窗口的网站组件。 WordPress MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder 4.3.3及之前版本存在跨站脚本漏洞，该漏洞源于对表单字段值的输入清理和输出转义不足，可能导致未授权攻击者注入任意Web脚本
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
umarbajwa MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder 0 ~ 4.3.3 -

II. Public POCs for CVE-2026-15052

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III. Intelligence Information for CVE-2026-15052

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Patches & Fixes for CVE-2026-15052 (2)

Vendor Advisories for CVE-2026-15052 (1)

Other References for CVE-2026-15052 (1)

IV. Related Vulnerabilities

Same product: MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder
Same vendor: umarbajwa
Same weakness: CWE-79

V. Comments for CVE-2026-15052

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