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.
Published: 2026-08-01
Score: 7.2 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Mon, 03 Aug 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sun, 02 Aug 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Umarbajwa
Umarbajwa mailchimp Subscribe Form, Optin Builder, Popup Builder, Form Builder
Wordpress
Wordpress wordpress
Vendors & Products Umarbajwa
Umarbajwa mailchimp Subscribe Form, Optin Builder, Popup Builder, Form Builder
Wordpress
Wordpress wordpress

Sat, 01 Aug 2026 08:30:00 +0000

Type Values Removed Values Added
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.
Title MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder <= 4.3.3 - Unauthenticated Stored Cross-Site Scripting via Form Field Values
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'}


Subscriptions

Umarbajwa Mailchimp Subscribe Form, Optin Builder, Popup Builder, Form Builder
Wordpress Wordpress
cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published:

Updated: 2026-08-03T18:58:05.886Z

Reserved: 2026-07-08T13:23:30.631Z

Link: CVE-2026-15052

cve-icon Vulnrichment

Updated: 2026-08-03T18:58:00.902Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-02T20:31:52Z

Weaknesses