What the vulnerability does
01Description
The Ultimate Blocks – WordPress Blocks Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's blocks in all versions up to, and including, 3.1.9 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. CVE-2024-37457 may be a duplicate of this issue.
Explanation of Vulnerability in Simple Terms
02Summary
Ultimate Blocks contains a stored cross-site scripting (XSS) vulnerability in versions up to 3.1.9. An authenticated user with low privileges can inject malicious scripts into block content that execute in the browsers of other site visitors. The vulnerability affects the block editor and can impact site integrity and visitor security.
What an attacker can do
03Attacker Capabilities
Inject malicious JavaScript that runs in other users' browsers when they view affected pages.
Potential impact on your site
04Site Impact
Visitors and admins may have their sessions hijacked, credentials stolen, or be redirected to malicious sites.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege WordPress account (e.g., contributor or editor role).
Key dates
06Disclosure timeline
July 2, 2024
CVE published
April 8, 2026
Record updated
