CVE-2025-8567: Nexter Blocks <= 4.5.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via Multiple Widgets
The Nexter Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via multiple widgets in all versions up to, and including, 4.5.4 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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-8567?
CVE-2025-8567 is classified as a high-severity vulnerability due to its potential for stored cross-site scripting attacks.
How do I fix CVE-2025-8567?
To fix CVE-2025-8567, update the Nexter Blocks plugin to version 4.5.5 or later where the vulnerability has been patched.
What type of attack does CVE-2025-8567 enable?
CVE-2025-8567 enables authenticated attackers to perform stored cross-site scripting attacks via multiple widgets.
Which versions of Nexter Blocks are affected by CVE-2025-8567?
All versions of Nexter Blocks up to and including 4.5.4 are affected by CVE-2025-8567.
Is input sanitization the main issue in CVE-2025-8567?
Yes, inadequate input sanitization and output escaping on user-supplied attributes is the main issue in CVE-2025-8567.