CVE-2026-18346: Auth Bypass (CVSS 5.3)

Description

The TikTok plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 1.4.1. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to overwrite the merchant's stored TikTok integration access token in wp_options, hijacking the site's TikTok Business and product catalog integration. Successful exploitation requires the attacker to supply a valid TikTok OAuth auth_code issued for the merchant's registered TikTok app, as the plugin's token exchange must receive a message='OK' response from TikTok's API before the stored access token is overwritten.

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CVSS v3.1 Score

5.3

MEDIUM

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

EPSS — Exploit Prediction

0.0026

Probability of exploitation

0.16%

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-862 Missing Authorization

References

Other References

https://plugins.trac.wordpress.org/browser/tiktok-for-business/tags/1.4.0/admin/Tt4b_Menu_Class.php#L397 https://plugins.trac.wordpress.org/browser/tiktok-for-business/tags/1.4.0/admin/Tt4b_Menu_Class.php#L417 https://plugins.trac.wordpress.org/browser/tiktok-for-business/tags/1.4.0/admin/tt4b_menu.php#L13 https://plugins.trac.wordpress.org/browser/tiktok-for-business/tags/1.4.0/mapi/Tt4b_Mapi_Class.php#L332 https://plugins.trac.wordpress.org/changeset?reponame=&old=3699236%40tiktok-for-business&new=3699236%40tiktok-for-business https://www.wordfence.com/threat-intel/vulnerabilities/id/31233f4e-4cd5-497f-9e8a-c65635596241?source=cve

Frequently Asked Questions

What is CVE-2026-18346? +

The TikTok plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 1.4.1. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to overwrite the merchant's stored TikTok integration access token in wp_options, hijacking the site's TikTok Business and product catalog integration. Successful exploitation requires the attacker to supply a valid TikTok OAuth auth_code issued for the merchant's registered TikTok app, as the plugin's token exchange must receive a message='OK' response from TikTok's API before the stored access token is overwritten. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-18346? +

CVE-2026-18346 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0026, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-18346? +

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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CVE-2026-18346