CVE-2026-19943
Received Received - Intake

Stored XSS in Gutenverse WordPress Plugin via titleTag Block

Publication date: 2026-08-25

Last updated on: 2026-08-25

Assigner: Wordfence

Description
The Gutenverse – WordPress Blocks, Page Builder & Site Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'titleTag' Block Attribute in all versions up to, and including, 4.0.2 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. The malicious titleTag value survives wp_kses_post on save because it is stored inside a block-comment delimiter and the live HTML is only synthesized at render time by do_blocks(), meaning the payload also fires in administrator and editor sessions during post preview.

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Meta Information

Published
2026-08-25
Last Modified
2026-08-25
Generated
2026-08-25
AI Q&A
2026-08-25
EPSS Evaluated
N/A
NVD
CVE-2026-19943
EUVD
EUVD-2026-65279

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
gutenverse gutenverse to 4.0.2 (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 'titleTag' block attribute. The issue occurs due to insufficient input sanitization and output escaping, enabling the scripts to execute when users access infected pages. The payload persists because it is stored in a block-comment delimiter and only rendered at runtime by do_blocks().

Detection Guidance

To detect this vulnerability, inspect WordPress sites using the Gutenverse plugin versions up to 4.0.2. Check for malicious scripts in the titleTag block attribute by reviewing page source or database entries. Use commands like grep to search for suspicious payloads in post content or block attributes.

Impact Analysis

If exploited, this vulnerability could allow attackers to steal user sessions, perform actions on behalf of users, or deface websites. It may also lead to unauthorized access to sensitive data, such as user credentials or personal information. The impact depends on the attacker's goals and the site's user privileges.

Compliance Impact

This vulnerability could violate GDPR by exposing user data or enabling unauthorized access to personal information. For HIPAA, it may risk protected health information if exploited on healthcare-related sites. Non-compliance may lead to legal penalties, reputational damage, and loss of trust.

Mitigation Strategies

Immediately update the Gutenverse plugin to the latest version beyond 4.0.2. Remove untrusted user contributions with contributor-level access or higher. Review and sanitize existing posts containing the titleTag block attribute for malicious scripts.

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