# Gutenverse <= 4.2.2 - Unauthenticated Denial of Service via Post Block Pagination Attributes

- **ID:** WPSEC-2026-3123
- **Plugin:** Gutenverse – WordPress Blocks, Page Builder & Site Editor (`gutenverse`), https://wordpress.org/plugins/gutenverse/
- **Affected versions:** from 1.5.0 before 4.2.3
- **Fixed in:** 4.2.3 (Update to 4.2.3 or later.)
- **Severity:** High 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **Weakness:** CWE-835
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-11-14)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/gutenverse
- **Fix released:** 2026-11-13
- **Published:** 2026-11-14
- **URL:** https://wpsec.com/vuln/WPSEC-2026-3123/

## Description

The Gutenverse plugin for WordPress is vulnerable to Denial of Service via the 'numberPost' and 'paginationNumberPost' post block attributes accepted by the public 'gutenverse-client/v1/postblock/data' REST endpoint in all versions up to, and including, 4.2.2. This is due to the attributes being cast to integers without a lower bound, so a value of zero or a negative number makes the loop in count_total_page() run without end. This makes it possible for unauthenticated attackers to tie up PHP workers and exhaust server resources by sending repeated requests with crafted block attributes.

## References

- https://wpsec.com/vuln/WPSEC-2026-3123/
- https://plugins.svn.wordpress.org/gutenverse/tags/4.2.3/
- https://wordpress.org/plugins/gutenverse/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-3123/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.