# BuddyPress <= 11.6.2 - Authenticated (Subscriber+) Missing Authorization to Activity Comment Creation via REST API

- **ID:** WPSEC-2026-1556
- **Plugin:** BuddyPress (`buddypress`), https://wordpress.org/plugins/buddypress/
- **Affected versions:** all versions before 11.6.3
- **Fixed in:** 11.6.3 (Update to 11.6.3 or later.)
- **Severity:** Medium 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-862
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-10-23)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/buddypress
- **Fix released:** 2026-10-22
- **Published:** 2026-10-23
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1556/

## Description

The BuddyPress plugin for WordPress is vulnerable to unauthorized activity comment creation via the activity REST API endpoint in all versions up to, and including, 11.6.2, due to a missing check on the target activity in the create permission callback. This makes it possible for authenticated attackers, with Subscriber-level access and above, to post comments on activities they are not allowed to comment on, such as activities in private or hidden groups they are not a member of.

## References

- https://wpsec.com/vuln/WPSEC-2026-1556/
- https://plugins.svn.wordpress.org/buddypress/tags/11.6.3/
- https://wordpress.org/plugins/buddypress/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1556/

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.