CVE-2026-0735: Webilop User Language Switch

Medium severity, CVSS 4.4. EPSS: 0.3% chance of exploitation in the next 30 days.

The User Language Switch plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'tab_color_picker_language_switch' parameter in all versions up to, and including, 1.6.10 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

Affected products

• Webilop User Language Switch: up to and including 1.6.10

Published 2026-02-14. Last modified 2026-06-17.