CVE-2026-19943

Gutenverse <= 4.0.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'titleTag' Block Attribute

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.

We have discovered 3,161 live websites that are affected by CVE-2026-19943.

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Affected Software

Product  Gutenverse
Category Wordpress Plugins
Vulnerable Domains3,161 live websites (100% of Gutenverse install base)
Vulnerable Versions
  • from 0 through 4.0.2
Vulnerable Versions Count112 versions ( 100% of all versions)


Common Weakness Enumeration

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')



Details

  • Published - Aug 25, 2026
  • Updated - Aug 25, 2026

Credits

  • Wordfence PRISM (finder)

Website Distribution by Country

Number of websites using CVE-2026-19943
United States1,021 websites


Germany259 websites
Netherlands137 websites
GB136 websites
Spain111 websites
France106 websites
Italy95 websites
Poland78 websites
Canada73 websites
Cyprus70 websites

Website Distribution by TLD

Number of websites using CVE-2026-19943
.com1,397 websites
.org182 websites
.de121 websites
.nl120 websites
.net77 websites
.it66 websites
.co.uk64 websites
.pl61 websites
.es52 websites
.com.br45 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2026-19943

Top websites that are affected by CVE-2026-19943. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
***************.com United States**,***
*****************.org Germany**,***
****.***.pl Poland***,***
*******.com United States***,***
**************.gov United States***,***
****************************.***.uk GB***,***
*******.me Cyprus***,***
**********.com United States***,***
**********.**.uk GB***,***
**********.**.nz New Zealand***,***
See full domain list

FAQ

CVE-2026-19943 is Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Gutenverse
A total of 3,161 websites have been identified as vulnerable to CVE-2026-19943, based on global website indexing conducted by WebTechSurvey.
The Gutenverse is affected by the CVE-2026-19943 vulnerability.
Gutenverse versions up to and including 4.0.2 are vulnerable to CVE-2026-19943.