CVE-2026-12399
Received Received - Intake

Stored XSS in Gutenverse WordPress Plugin via Admin Settings

Publication date: 2026-06-27

Last updated on: 2026-06-27

Assigner: Wordfence

Description
The Gutenverse – WordPress Blocks, Page Builder & Site Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 3.8.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with editor-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

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Meta Information

Published
2026-06-27
Last Modified
2026-06-27
Generated
2026-06-27
AI Q&A
2026-06-27
EPSS Evaluated
N/A
NVD
CVE-2026-12399
EUVD
EUVD-2026-39959

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
gutenverse gutenverse to 3.8.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

The Gutenverse – WordPress Blocks, Page Builder & Site Editor plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in all versions up to and including 3.8.0. This vulnerability arises because the plugin does not properly sanitize input or escape output in the admin settings.

Authenticated users with editor-level permissions or higher can exploit this flaw to inject arbitrary web scripts into pages. These scripts execute whenever any user accesses the infected page.

This vulnerability specifically affects multi-site WordPress installations and installations where the unfiltered_html capability has been disabled.

Impact Analysis

This vulnerability can allow attackers with editor-level access to inject malicious scripts that execute in the browsers of users visiting the affected pages.

Such script execution can lead to theft of user credentials, session hijacking, defacement, or other malicious actions that compromise the integrity and confidentiality of the website and its users.

Because the vulnerability requires authenticated access with elevated permissions, the risk is somewhat limited but still significant in environments where multiple users have editor or higher roles.

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