CVE-2026-109985: xSpeed Cache: AI-Powered Performance Hub with MCP, Caching & CDN <= 1.4.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'post_content' Parameter
The xSpeed Cache: AI-Powered Performance Hub with MCP, Caching & CDN plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'content' parameter in all versions up to, and including, 1.4.2 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.
Affected Software
Event History
Frequently Asked Questions
Who can exploit this issue?
An attacker must be authenticated to WordPress with contributor-level access or higher. Exploitation does not require user interaction from the attacker.
Which installations are affected?
All versions of the xSpeed Cache plugin up to and including 1.4.2 are affected. The provided data does not identify a fixed version.
What is the impact of a successful exploit?
A permitted attacker can inject arbitrary web scripts into page content. Those scripts execute when another user accesses the injected page, potentially affecting the confidentiality and integrity of that user's session or actions.
How can administrators determine whether they may be affected?
Check whether the xSpeed Cache plugin is installed and whether its version is 1.4.2 or earlier. Review page content created or modified by contributor-level and higher accounts for unexpected script content.