CVE-2026-16587
Received Received - Intake

Authorization Bypass in Advanced Form Integration WordPress Plugin

Publication date: 2026-07-28

Last updated on: 2026-07-28

Assigner: Wordfence

Description
The Advanced Form Integration — Connect Forms to 200+ Apps plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 2.6.0. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to overwrite the site's stored MailUp OAuth tokens in the adfoin_mailup_keys option with attacker-controlled tokens, hijacking future form-submission data to a MailUp account they control or nulling the tokens to break the integration entirely. This is exploitable by any authenticated user who can reach /wp-admin/profile.php, as admin_init fires for all logged-in users visiting any wp-admin page.

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Meta Information

Published
2026-07-28
Last Modified
2026-07-28
Generated
2026-07-28
AI Q&A
2026-07-28
EPSS Evaluated
N/A
NVD
CVE-2026-16587
EUVD
EUVD-2026-49695

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
advanced_form_integration connect_forms_to_200_apps to 2.6.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

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Executive Summary

The Advanced Form Integration plugin for WordPress has an authorization bypass flaw in versions up to 2.6.0. It fails to verify user permissions before allowing actions. Authenticated attackers with subscriber-level access or higher can exploit this to overwrite stored MailUp OAuth tokens via the adfoin_mailup_keys option. This lets them redirect form-submission data to their own MailUp account or disable the integration entirely.

Detection Guidance

Check WordPress admin access logs for unusual activity on /wp-admin/profile.php. Inspect stored MailUp OAuth tokens in the adfoin_mailup_keys option for unauthorized modifications. Use WordPress security plugins to monitor plugin file changes or unauthorized token updates.

Impact Analysis

If you use this plugin, an attacker could hijack your form-submission data by replacing the OAuth tokens with their own. This means sensitive data submitted through your forms might be sent to the attacker instead of your intended MailUp account. Alternatively, the attacker could break the integration entirely by nulling the tokens.

Compliance Impact

This vulnerability could lead to unauthorized access or loss of sensitive data submitted through forms, potentially violating GDPR or HIPAA requirements for data protection and confidentiality. Organizations using this plugin may face compliance risks if form data is intercepted or mishandled due to the flaw.

Mitigation Strategies

Update the Advanced Form Integration plugin to the latest version beyond 2.6.0. Revoke and regenerate MailUp OAuth tokens. Restrict subscriber-level access to sensitive admin pages. Monitor for unauthorized token changes or form submission redirections.

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