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 Ultimate Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘content’ parameter in all versions up to, and including, 3.2.7 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.
Explanation of Vulnerability in Simple Terms
Ultimate Blocks versions 3.2.7 and earlier contain a cross-site scripting vulnerability in the Gutenberg block editor. An authenticated user with low privileges can inject malicious scripts that execute in the browsers of other site users, potentially compromising their accounts or stealing sensitive data. The vulnerability affects the entire site scope due to its stored nature.
What an attacker can do
Inject malicious JavaScript that runs in other users' browsers when they view affected content.
Potential impact on your site
Site users' accounts and data are at risk if a compromised or malicious low-privilege user injects scripts into block content.
Conditions required to exploit
Attacker needs a low-privilege WordPress account (e.g., contributor or editor role) and network access to the site.
Key dates
External resources
