CVE-2026-19943Medium· 6.4▾ Sunlit

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 sanitiza…

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score35/ 100 · Low

impact 35.2 · likelihood 0 · exploitation 0

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Proof of concept

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Published

Aug 25, 2026

Updated

Oct 12, 2026

CVSS

6.4

Vendor

—

Product

—

CWE

CWE-79

Depth score

35 · Low

EPSS

0.19% · p8

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 48 days

Aug 25, 2026Published
Disclosed via NVD
Oct 12, 2026Record revised
Last analysed / modified upstream
Oct 12, 2026EPSS first tracked
0.2%

CWE-79 #nvd

Full technical detail▾

Overview

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.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd

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