CVE-2026-9656: Information Disclosure (CVSS 4.3)

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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CVSS v3.1 Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS — Exploit Prediction

0.0016

Probability of exploitation

0.05%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-200 CWE-200

References

Other References

https://plugins.trac.wordpress.org/browser/leadin/tags/11.3.45/public/admin/class-adminconstants.php#L190 https://plugins.trac.wordpress.org/browser/leadin/tags/11.3.45/public/admin/class-gutenberg.php#L44 https://plugins.trac.wordpress.org/browser/leadin/tags/11.3.45/public/auth/class-oauth.php#L46 https://plugins.trac.wordpress.org/browser/leadin/tags/11.3.45/public/class-assetsmanager.php#L150 https://plugins.trac.wordpress.org/changeset?old_path=%2Fleadin/tags/11.3.62&new_path=%2Fleadin/tags/11.3.64 https://www.wordfence.com/threat-intel/vulnerabilities/id/718d7ea3-d8ba-46a0-9ab1-72657bd82c17?source=cve

Frequently Asked Questions

What is CVE-2026-9656? +

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. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-9656? +

CVE-2026-9656 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0016, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-9656? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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