KEVWire

Security intelligence, with context.

Response snapshot Oct 26, 2026, 21:38 UTC

Back to the wire
Permalink
Disclosed incidenthibp-csdn

China Software Developer Network breach: 6,414,990 accounts exposed

In 2011, the China Software Developer Network (CSDN) suffered a data breach that exposed over 6M user records . The data included email addresses alongside usernames and plain text passwords.

At a glance

Sources
1 source

What to do

If you or your organization used this service, change reused passwords, watch for phishing that uses the exposed data, and check the disclosure for the organization's guidance.

Read Have I Been Pwned: China Software Developer Network (opens a new tab)

Related technology

Sources

  1. Primary source

    Have I Been Pwned: China Software Developer Network (opens a new tab)

    Verified breach loaded into Have I Been Pwned: account count, exposed data types, and dates.

    Published Checked

  2. Primary source

    Have I Been Pwned breach API (opens a new tab)

    The breach list that supplied this entry.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2025, November 27). China Software Developer Network breach: 6,414,990 accounts exposed. https://kevwire.com/record/hibp-csdn

MLA

"China Software Developer Network breach: 6,414,990 accounts exposed." KEVWire, 27 Nov. 2025, kevwire.com/record/hibp-csdn.

Chicago

KEVWire. "China Software Developer Network breach: 6,414,990 accounts exposed." Last modified November 27, 2025. https://kevwire.com/record/hibp-csdn.

Evidence summary (plain text)

China Software Developer Network breach: 6,414,990 accounts exposed (Nov 27, 2025).
In 2011, the China Software Developer Network (CSDN) suffered a data breach that exposed over 6M user records . The data included email addresses alongside usernames and plain text passwords.
Sources:
Have I Been Pwned: China Software Developer Network: https://haveibeenpwned.com/Breach/CSDN
Have I Been Pwned breach API: https://haveibeenpwned.com/api/v3/breaches
Record ID: hibp-csdn.
Record origin: Ingested record.
AI evidence: Not assessed.
About this data

This record was ingested from a data source. Retrieved: Oct 26, 2026, 21:25 UTC. Ingestion is not an independent editorial investigation.

Verified by Have I Been Pwned. Breach date: 2011-12-21; loaded 2025-11-27. Exposed data: Email addresses, Passwords, Usernames. Counts are accounts in the loaded data, not necessarily distinct people.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

Your account

Email alerts

Email alerts are not available yet. To follow your stack today, use its RSS feed, which honors your filters, or connect an AI agent through the API.

Suggest an improvement

Ideas, missing sources, corrections, and bugs are all welcome. No account needed. Suggestions are reviewed by a person before anything changes.

Record details

Record detail