[Investigating][Severity: Major][Intrusion]

UPSIDER: break-in at the members' site of the Breakthrough GRID executive community leaked data of 544 people

Registration data of 544 members and former members from 187 companies was taken from the site of the Breakthrough GRID executive community. The site is down.

Disclosed

2026-10-27

Organizations involved

Leaked or at risk

544

Downtime

Unknown

What happened

2026-10-27
A third party broke into the members' site and took the data stored there. UPSIDER disclosed it the same day. [1] [2]

Impact

Data of 544 people from 187 companies, including some former members, leaked. It covers the registration data of members and former members and what they shared on the service; the details are being sent to each person by email. [1] [2]

The systems holding member, card, statement and payment data of its other services, such as the UPSIDER and PRESIDENT CARD corporate cards, were not accessed and nothing leaked from them. [1]

Response

All functions of the members' site were stopped and outside access was blocked. There is no restart date. The cause is being investigated, and the other services are being checked for the same problem. [1]