Piwigo 13.8.0 and below is vulnerable to SQL Injection in the parameters max_level and min_register. These parameters are used in ws_user_gerList function from file include\ws_functions\pwg.users.php and this same function is called by ws.php file at some point can be used for searching users in advanced way in /admin.php?page=user_list.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
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