SourceNext said on 15 October that third-party unauthorized access to the member data it manages had leaked personal information of registered customers [1]. It said it confirmed the access on 13 October and finished containment by 13:36 that day, and that a member-information API had been abused from 9 October; up to 22,519,960 records may have been taken, including email addresses, passwords, names, addresses, phone numbers and dates of birth, while credit-card data was not in the affected system [1]. The company is requiring a password reset at login, asks anyone who reused the same email and password on other services to change those passwords too, and warns customers not to open unsolicited email or SMS links or attachments, or enter personal data or passwords on suspicious sites [1].
SourceNext says a member-data API was abused, exposing up to 22,519,960 customer records including passwords
1 min read
- Disclosed
- Oct 15, 2026
- Occurred
- Oct 9, 2026
- Published
- Nov 12, 2026
- Last updated
- Nov 12, 2026
- Scale
- 22,519,960 people[1]
- CVSS basis
- Our assessment
- Attack vector
- Impact
- Data type
- Actor type
- Motivation
On this page
30-second summary
What happened
Who is affected
Industries mainly affected: Technology
What to do nowOur advice
- Follow the login prompt and reset your SourceNext password promptly [1].
- If you reused the same email and password on other services, change those passwords as well .
Timeline
Technical details
Remediation
Vendor guidance
- 1Reset your password, stop reusing it, and do not open unsolicited links mitigate[1]
Follow the on-screen reset prompt, change the same password elsewhere if reused, and do not open unsolicited links or attachments.
References
Official / primary1
- [1]ソースネクスト2026-10-15Accessed 2026-11-12Snapshot 2026-11-12 sha256 31c5a786b83a
“画面の案内に従って速やかにパスワードの再設定をお願いいたします。”
This site aggregates public information and is not security consulting advice. Test remediation steps before applying.