[URGENT] Forced Reset of SFC-CNS Login Passwords and Request for Reconfiguration
Important notice from Shonan Fujisawa KIC and CSIRT.
Due to the possibility of unauthorized access to the SFC-CNS email system, we performed a forced reset of CNS email passwords on December 23. For the background of this case, please refer to the following announcement.
[Urgent] Notice of forced password reset due to potential unauthorized access to the SFC-CNS email system
Regarding the "CNS account login password," for which we strongly recommended a change in the above notice, we will perform a forced reset (invalidation) today as follows to ensure the prevention of information leakage and secondary damage.
CNS Email Password: A dedicated password specifically for sending and receiving CNS emails.
1. Forced Reset of CNS Login Passwords
To prevent unauthorized access, all CNS account login passwords will be forcibly reset at the time mentioned above. All CNS services will become unavailable.
Please immediately follow the steps in "3. Procedure for Resetting Your Password."
2. Those Affected by This Measure
-
All SFC-CNS users (including sub-account users)
Excluding those who changed their CNS login password during the following period:
- after 12:00 a.m. on Novermber 28, 2025, and before 12:59 p.m. on December 23, 2025
- after 1:00 p.m. on December 23, 2025, and before 11:59 a.m. on December 25, 2025
3. Procedure for Resetting Your CNS Login Password
If you are unable to log in to CNS services after the reset, please reconfigure your password using the following steps. The procedure differs depending on whether you have a keio.jp account.
The temporary password is valid until Monday, February 9, 2026.
After this period, the temporary password will no longer be usable.
A. If you have a keio.jp account (Students, Faculty, Staff, etc.)
-
Please access [Software License Acquisition] on keio.jp.
- Click "Details" in the "SFC-CNS Password" column under the list of available licenses.
For users who have already reset their passwords between November 28, 2025, 12:00 a.m. and December 25, 12:00 p.m., this notification itself will not be displayed. - Make a note of the displayed temporary password.
-
Access the following site, log in with the temporary password obtained in step 3, and register a new "CNS Login Password".
At that time, never set the same password as your previous one. There is a risk of compromise.
[SFC-CNS Settings]
B. If you do not have a keio.jp account
-
In Person: Please come to the Shonan Fujisawa KIC office with your ID card.
Refer to this link (https://www.sfc.itc.keio.ac.jp/en/contact_sfc.html) for the office location and hours. - By Mail (Only SFC Institute Researchers): We will mail temporary passwords to your home or registered address in order. Once received, use the temporary password to set your new "CNS Login Password" via the site above.
4. Regarding Password Settings and Prevention of Secondary Damage
-
Do not use the same password as before:
Considering the possibility of leakage, please avoid using the same password or easily guessable patterns. -
Do not reuse passwords across different services:
If you use the same string as your CNS password or CNS email password for your keio.jp password or other external services (SNS, banking, etc.), we strongly recommend changing them immediately.
-
Use MFA (Multi-Factor Authentication):
Please consider setting up MFA for keio.jp. If MFA is enabled, you can minimize damage even if your password is compromised.
https://sites.google.com/keio.jp/kmfa-info-1st-en/
We apologize for the great inconvenience, but we ask for your understanding and cooperation in maintaining university-wide security.
Last-Modified: December 25, 2025
The content ends at this position.