CVE-2026-18742

The Flatsome theme for WordPress is vulnerable to Stored Cross-Site Scripting via 'data-text-sec', 'data-title', and 'title' Attributes via Custom HTML Block in all versions up to, and including, 3.20.12 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload survives server-side sanitization because wp_kses_post permits data-* attributes globally via _wp_add_global_attributes, allowing attacker-controlled values in data-text-sec, data-title, and title attributes to persist in saved post content and be later interpreted as HTML by the ux-countdown, scroll-to, and lightbox-gallery JavaScript behaviors.

• CWE-79

• https://themeforest.net/item/flatsome-multipurpose-responsive-woocommerce-theme/5484319#item-description__change-log
• https://www.wordfence.com/threat-intel/vulnerabilities/id/d6567c87-9e69-4e18-bea3-08d8aae23ef6?source=cve

Published

Nov 14, 2026

Last Modified

Nov 14, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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