# Post Carousel <= 4.0.8 - Unauthenticated Non-Public Post Type Information Exposure via Smart Search REST Endpoint

- **ID:** WPSEC-2026-1454
- **Plugin:** Smart Post – Post Grid, Post Carousel, Post Slider Gutenberg Blocks for Blog & News (`post-carousel`), https://wordpress.org/plugins/post-carousel/
- **Affected versions:** from 4.0.0 before 4.0.9
- **Fixed in:** 4.0.9 (Update to 4.0.9 or later.)
- **Severity:** Medium 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
- **Weakness:** CWE-200
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-10-22)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/post-carousel
- **Fix released:** 2026-10-21
- **Published:** 2026-10-22
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1454/

## Description

The Smart Post plugin for WordPress is vulnerable to Sensitive Information Exposure via the sps-blocks/v2/smart-search REST endpoint and the sp_smart_post_block_post_query AJAX action in all versions from 4.0.0 up to, and including, 4.0.8. This is due to these post queries using a request-supplied post type without restricting it to public post types. This makes it possible for unauthenticated attackers to retrieve titles, excerpts, authors and other details of published entries of non-public post types, such as WooCommerce coupons or other plugins' internal records.

## References

- https://wpsec.com/vuln/WPSEC-2026-1454/
- https://plugins.svn.wordpress.org/post-carousel/tags/4.0.9/
- https://wordpress.org/plugins/post-carousel/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1454/

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.