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6.4
XO Event Calendar plugin allows hackers to inject malicious scripts in WordPress
CVE-2026-0556
Summary
The XO Event Calendar plugin for WordPress has a security flaw that allows hackers to inject malicious scripts into websites. This could allow them to take control of a website or steal sensitive information. To stay safe, update the plugin to the latest version or remove it if you don't use it.
Original title
The XO Event Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'xo_event_field' shortcode in all versions up to, and including, 3.2.10 due to insufficient ...
Original description
The XO Event Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'xo_event_field' shortcode in all versions up to, and including, 3.2.10 due to insufficient input sanitization and output escaping on user supplied attributes. 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.
nvd CVSS3.1
6.4
Vulnerability type
CWE-79
Cross-site Scripting (XSS)
Published: 19 Feb 2026 · Updated: 11 Mar 2026 · First seen: 6 Mar 2026