CVE-2026-9656
Received Received - Intake

Sensitive Information Exposure in HubSpot Marketing WordPress Plugin

Publication date: 2026-07-17

Last updated on: 2026-07-17

Assigner: Wordfence

Description
The HubSpot All-In-One Marketing – Forms, Popups, Live Chat plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 11.3.62 via the wp_localize_script() / window.leadinConfig JavaScript object. This makes it possible for authenticated attackers, with contributor-level access and above, to extract the site's plaintext HubSpot OAuth refresh token exposed via the window.leadinConfig JavaScript object, which can then be used to access or modify data in the connected HubSpot tenant. Although the refresh token is stored at rest with AES-256-CTR encryption, decryption occurs server-side before the plaintext value is passed to wp_localize_script(), rendering the at-rest encryption ineffective against this exposure path.

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Meta Information

Published
2026-07-17
Last Modified
2026-07-17
Generated
2026-07-17
AI Q&A
2026-07-17
EPSS Evaluated
N/A
NVD
CVE-2026-9656
EUVD
EUVD-2026-45152

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
hubspot all-in-one_marketing to 11.3.62 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

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Executive Summary

This WordPress plugin vulnerability allows authenticated attackers with contributor-level access or higher to extract a plaintext HubSpot OAuth refresh token via a JavaScript object. The token is exposed through the wp_localize_script() function and can be used to access or modify data in the connected HubSpot tenant.

Detection Guidance

This vulnerability can be detected by checking for the presence of the exposed plaintext HubSpot OAuth refresh token in the window.leadinConfig JavaScript object. Inspecting the source code of pages using the plugin or monitoring network traffic for requests containing this token may help identify exposure.

Impact Analysis

An attacker could gain unauthorized access to your HubSpot account and manipulate your marketing data, contacts, or campaigns. They might also extract sensitive information tied to your HubSpot integration, leading to data breaches or unauthorized actions.

Compliance Impact

This vulnerability could lead to unauthorized access to personal data, violating GDPR and HIPAA requirements for data protection and access controls. Organizations may face compliance violations, fines, or reputational damage if exploited.

Mitigation Strategies

Immediately update the HubSpot All-In-One Marketing plugin to the latest version beyond 11.3.62. If an update is unavailable, consider disabling the plugin temporarily until a patch is released. Review user roles and permissions to ensure only trusted users have contributor-level access or higher.

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