CVE-2023-4021: Modern Events Calendar lite < 7.1.0 - Authenticated (Admin+) Stored Cross-Site Scripting
The Modern Events Calendar lite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Google API key and Calendar ID in versions up to, but not including, 7.1.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions 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 unfilteredhtml has been disabled.
Affected Software
Remediation
Patch Available
Event History
Frequently Asked Questions
What is CVE-2023-4021?
CVE-2023-4021 is a vulnerability in the Modern Events Calendar lite plugin for WordPress that allows for Stored Cross-Site Scripting.
How does CVE-2023-4021 occur?
CVE-2023-4021 occurs due to insufficient input sanitization and output escaping in the Google API key and Calendar ID fields.
What is the severity of CVE-2023-4021?
The severity of CVE-2023-4021 is medium, with a severity score of 4.4.
Which versions of the Modern Events Calendar lite plugin for WordPress are affected by CVE-2023-4021?
Versions up to, but not including, 7.1.0 of the Modern Events Calendar lite plugin for WordPress are affected by CVE-2023-4021.
How can I mitigate CVE-2023-4021?
To mitigate CVE-2023-4021, it is recommended to update to version 7.1.0 or newer of the Modern Events Calendar lite plugin for WordPress.