CVE-2026-92746: Gutenverse <= 4.0.8 - Authenticated (Contributor+) Stored Cross-Site Scripting via Post Comment Block 'suffixMain' Attribute
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 wpksespost 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.
Affected Software
Event History
Frequently Asked Questions
Who can exploit this issue?
An attacker needs an authenticated WordPress account with Contributor-level permissions or higher. They can inject a payload through the Post Comment Block's suffixMain attribute.
When does the injected script execute?
The script executes when a user accesses a page containing the injected block. The payload is stored in a Gutenberg block delimiter comment and becomes exploitable HTML during PHP rendering.
Does WordPress core sanitization prevent exploitation?
No. WordPress core wp_kses_post sanitization does not mitigate this issue because the payload is not stored as a raw HTML tag; it is rendered later at the PHP render stage.