# Co-Authors Plus <= 4.2.1 - Unauthenticated Sensitive Information Exposure via Author Private Post Counts

- **ID:** WPSEC-2026-2743
- **Plugin:** Co-Authors Plus (`co-authors-plus`), https://wordpress.org/plugins/co-authors-plus/
- **Affected versions:** all versions before 4.2.2
- **Fixed in:** 4.2.2 (Update to 4.2.2 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 2026-11-08)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/co-authors-plus
- **Fix released:** 2026-11-07
- **Published:** 2026-11-08
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2743/

## Description

The Co-Authors Plus plugin for WordPress is vulnerable to Sensitive Information Exposure via the count_user_posts() filter in all versions up to, and including, 4.2.1, due to author post counts including private posts whoever is viewing. Core's REST API users route lets anyone read a user who has a non-zero post count. This makes it possible for unauthenticated attackers to read the profiles of users who only have private posts, and to learn that those private posts exist.

## References

- https://wpsec.com/vuln/WPSEC-2026-2743/
- https://plugins.svn.wordpress.org/co-authors-plus/tags/4.2.2/
- https://wordpress.org/plugins/co-authors-plus/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2743/

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.