# Post Carousel <= 4.0.9 - Unauthenticated Sensitive Information Exposure via sp_smart_post_block_meta_data_query AJAX Action

- **ID:** WPSEC-2026-2191
- **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 4.0.10
- **Fixed in:** 4.0.10 (Update to 4.0.10 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 2026-11-03)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/post-carousel
- **Fix released:** 2026-10-30
- **Published:** 2026-11-03
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2191/

## Description

The Smart Post plugin for WordPress is vulnerable to Sensitive Information Exposure via the sp_smart_post_block_meta_data_query AJAX action in all versions from 4.0.0 up to, and including, 4.0.9, due to the action being open to unauthenticated users without a capability check while returning editor-only data. This makes it possible for unauthenticated attackers to get the IDs, display names and roles of all administrator, editor and author accounts, along with every post meta key stored on the site.

## References

- https://wpsec.com/vuln/WPSEC-2026-2191/
- https://plugins.svn.wordpress.org/post-carousel/tags/4.0.10/
- https://wordpress.org/plugins/post-carousel/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2191/

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.