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Description

The Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'configurablePrefix' Block Attribute in all versions up to, and including, 6.1.4 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.

PUBLISHED Reserved 2026-06-04 | Published 2026-06-25 | Updated 2026-06-25 | Assigner Wordfence




MEDIUM: 6.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Problem types

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

Product status

Default status
unaffected

Any version
affected

Timeline

2026-05-14:Discovered
2026-06-04:Vendor Notified
2026-06-24:Disclosed

Credits

Viet Anh Ngo finder

References

www.wordfence.com/...-c1c9-48ed-adab-34c0ac3da8bf?source=cve

plugins.trac.wordpress.org/...des/Blocks/TableOfContents.php

plugins.trac.wordpress.org/...des/Blocks/TableOfContents.php

plugins.trac.wordpress.org/...le-of-contents/src/frontend.js

cve.org (CVE-2026-10833)

nvd.nist.gov (CVE-2026-10833)

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