CVSS base score
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
What the vulnerability does
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.
Explanation of Vulnerability in Simple Terms
Nexter Blocks allows authenticated users to inject malicious scripts that execute in other users' browsers. The vulnerability exists in versions up to 4.5.4 and affects the page builder interface. An attacker with low-level access can craft input that bypasses sanitization, causing stored cross-site scripting (XSS) attacks. Site administrators and other users viewing affected content are at risk.
What an attacker can do
Inject malicious scripts that run in other users' browsers when they view the page builder.
Potential impact on your site
Other site users, including admins, may have their sessions hijacked or credentials stolen via malicious scripts.
Conditions required to exploit
Attacker must have a low-privilege user account (e.g., contributor or editor role) on the site.
Key dates
External resources
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