CVE-2026-48943
Description
K2 ≤ 2.24 contains a mass-assignment defect in the K2 system user plugin `plg_user_k2`. A Registered Joomla user, by including the field `K2UserForm=1` in a standard `com_users` `profile.save` POST, can write arbitrary values into the `notes`, `image`, and `plugins` columns of their own row in the `#__k2_users` table — none of which are exposed by the K2 frontend profile-edit form.
Summary dbcve.org
A mass-assignment vulnerability in K2 user plugin (plg_user_k2) allows authenticated Registered Joomla users to write arbitrary values to the `notes`, `image`, and `plugins` columns in their own #__k2_users table row by including the hidden parameter `K2UserForm=1` in a standard com_users profile.save POST request, bypassing the frontend profile form which does not expose these fields.
Mitigation
Upgrade to K2 version >2.24 when available, or temporarily restrict Registered user access to the K2 user profile functionality until a patch is applied.