CVE-2026-12757
Received Received - Intake

Arbitrary Shortcode Execution in Email Subscribers WordPress Plugin

Publication date: 2026-09-07

Last updated on: 2026-09-07

Assigner: Wordfence

Description
The The Email Subscribers & Newsletters – Email Marketing, Post Notifications & Newsletter Plugin for WordPress plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 5.9.27. This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes.

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Meta Information

Published
2026-09-07
Last Modified
2026-09-07
Generated
2026-09-07
AI Q&A
2026-09-07
EPSS Evaluated
N/A
NVD
CVE-2026-12757
EUVD
EUVD-2026-72402

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mailpoet email_subscribers_and_newsletters to 5.9.27 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-94 The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

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Executive Summary

This vulnerability allows unauthenticated attackers to execute arbitrary shortcodes in the Email Subscribers & Newsletters WordPress plugin. It exists because the plugin does not properly validate user input before running the do_shortcode function, enabling malicious code execution.

Detection Guidance

Check for unauthorized shortcode execution in WordPress logs or plugin files. Look for suspicious activity in access logs related to the MailPoet plugin endpoints. No specific commands are provided in the context.

Impact Analysis

An attacker could exploit this to perform unauthorized actions on your WordPress site, such as stealing data, redirecting visitors, or injecting malicious content. Since no authentication is required, any visitor could potentially trigger the vulnerability.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR or HIPAA requirements for protecting personal data. Unauthorized code execution may expose sensitive user information, resulting in legal penalties and loss of trust.

Mitigation Strategies

Update the MailPoet plugin to the latest version beyond 5.9.27. If an update is unavailable, consider disabling the plugin temporarily until a patch is released. Review user roles and permissions to limit access to the plugin.

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