admin.php?page=notification_by_mail in Piwigo 2.9.5 has XSS via the nbm_send_html_mail, nbm_send_mail_as, nbm_send_detailed_content, nbm_complementary_mail_content, nbm_send_recent_post_dates, or param_submit parameter. This is exploitable via CSRF.
admin.php?page=account_billing in Piwigo 2.9.5 has XSS via the vat_number, billing_name, company, or billing_address parameter. This is exploitable via CSRF.