What the vulnerability does
01Description
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.
Explanation of Vulnerability in Simple Terms
02Summary
User Language Switch versions 1.6.10 and earlier contain a cross-site scripting (XSS) vulnerability. An authenticated administrator with high privileges can inject malicious scripts that affect other users across the site. The vulnerability requires specific conditions to exploit and has limited impact on confidentiality and integrity.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers when they visit affected pages.
Potential impact on your site
04Site Impact
Administrators could be tricked into injecting scripts affecting site visitors; limited to low-impact data exposure or modification.
Conditions required to exploit
05Prerequisites
Attacker must be an authenticated administrator. High attack complexity; specific conditions required to exploit.
Key dates
06Disclosure timeline
February 14, 2026
CVE published
April 8, 2026
Record updated
