CVE-2026-78363
Deferred Deferred - Pending Action

Unauthenticated Shortcode Execution in MW WP Form

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: WPScan

Description
The MW WP Form WordPress plugin before 5.1.5 does not prevent shortcodes in user-submitted values from being executed when it merges those values into a message that it later processes for shortcodes, allowing unauthenticated users to run any shortcode registered on the site. Exploitation requires the site to have been configured to echo a submitted value back to the visitor after submission.

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Meta Information

Published
2026-09-01
Last Modified
2026-09-01
Generated
2026-09-21
AI Q&A
2026-09-01
EPSS Evaluated
2026-09-20
NVD
CVE-2026-78363
EUVD
EUVD-2026-68991

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mw_wp_form mw_wp_form to 5.1.5 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-74 The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

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Executive Summary

This vulnerability affects the MW WP Form WordPress plugin versions before 5.1.5. It allows unauthenticated users to execute arbitrary shortcodes by submitting values that are later processed and displayed back to visitors. The issue occurs because the plugin merges user-submitted values into messages without preventing shortcode execution.

Detection Guidance

Check the installed version of the MW WP Form plugin. If it is below 5.1.5, the system is vulnerable. Use WordPress admin panel or run a command like 'wp plugin list' if using WP-CLI to verify the version.

Impact Analysis

An attacker could exploit this to run malicious shortcodes on your site, potentially leading to unauthorized actions, data theft, or further compromise. This requires your site to be configured to echo submitted form values back to users after submission.

Compliance Impact

This vulnerability could potentially affect compliance with GDPR and HIPAA by allowing unauthorized execution of shortcodes, which may lead to data exfiltration or manipulation. If user-submitted data is echoed back and processed without restrictions, it might expose sensitive information or enable actions that violate data protection requirements.

Mitigation Strategies

Update the MW WP Form plugin to version 5.1.5 or later immediately. Disable the plugin if an update is not possible, and review form configurations to avoid echoing user-submitted values back to visitors.

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