CVE-2026-92746
Received Received - Intake

Stored XSS in Gutenverse WordPress Plugin via Post Comment Block

Publication date: 2026-09-25

Last updated on: 2026-09-25

Assigner: Wordfence

Description
The Gutenverse – WordPress Blocks, Page Builder & Site Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Post Comment Block 'suffixMain' Attribute in all versions up to, and including, 4.0.8 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. WordPress core wp_kses_post sanitization does not mitigate this vulnerability because the payload is stored inside a Gutenberg block delimiter comment rather than as a raw HTML tag, and is only rendered as exploitable HTML at the PHP render stage.

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Meta Information

Published
2026-09-25
Last Modified
2026-09-25
Generated
2026-09-25
AI Q&A
2026-09-25
EPSS Evaluated
N/A
NVD
CVE-2026-92746
EUVD
EUVD-2026-86547

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
gutenverse gutenverse to 4.0.8 (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

This vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the Gutenverse WordPress plugin. It allows authenticated attackers with contributor-level access or higher to inject malicious scripts via the Post Comment Block's 'suffixMain' attribute. The issue arises due to insufficient input sanitization and output escaping, enabling arbitrary web scripts to be stored and executed when users access infected pages.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using the Gutenverse plugin for versions up to 4.0.8. Check for suspicious comments in page content containing the Post Comment Block 'suffixMain' attribute with malicious scripts. Use WordPress admin panel to review page source or database entries for unusual block delimiters.

Impact Analysis

If exploited, this vulnerability could allow attackers to steal user sessions, deface websites, or redirect visitors to malicious sites. Users with contributor-level access or above could compromise the site, affecting all visitors. The impact depends on the site's user base and the attacker's goals.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR or HIPAA if exploited to steal personal data or protected health information. Stored XSS may result in unauthorized access to user data, triggering regulatory fines or legal consequences for failing to protect sensitive information.

Mitigation Strategies

Immediately update the Gutenverse plugin to the latest version beyond 4.0.8. Remove any untrusted user accounts with contributor-level access or higher. Review pages for injected scripts and clean them. Consider using security plugins to scan for stored XSS payloads in block comments.

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