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On August 14, 2023, our Wordfence Threat Intelligence team identified and began the responsible disclosure process for a stored Cross-Site Scripting (XSS) vulnerability in LiteSpeed Cache plugin, which is actively installed on more than 4,000,000 WordPress websites, making it the most popular cache plugin. The vulnerability enables threat actors with contributor-level permissions or higher to inject malicious web scripts into pages using the plugin’s shortcode.
All Wordfence Premium, Wordfence Care, and Wordfence Response customers, as well as those still using the free version of our plugin, are protected against any exploits targeting this vulnerability by the Wordfence firewall’s built-in Cross-Site Scripting protection.
We contacted The LiteSpeed Cache Team on August 14, 2023, and we received a response on the same day. After providing full disclosure details, the developer team made a patch on August 16, 2023, and released it to the WordPress repository on October 10, 2023. We would like to commend the LiteSpeed Technologies for their prompt response and timely patch.