What the vulnerability does
01Description
The Gutenverse – Ultimate WordPress FSE Blocks Addons & Ecosystem plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'separatorIconSVG' parameter in versions up to, and including, 3.5.3 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
02Summary
Gutenverse versions up to 3.5.3 contain a cross-site scripting vulnerability that allows authenticated users to inject malicious scripts affecting other site visitors. The vulnerability exists in the plugin's handling of user input and can impact site functionality and visitor security. Site administrators should update to a version newer than 3.5.3 as soon as possible.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers when they visit affected pages.
Potential impact on your site
04Site Impact
Visitors and other users may have their sessions compromised, data stolen, or be redirected to malicious sites.
Conditions required to exploit
05Prerequisites
Attacker must have a WordPress user account with at least low-level privileges (e.g., contributor or above).
Key dates
06Disclosure timeline
May 5, 2026
CVE published
May 6, 2026
Record updated
