Have I Been Pwned indexed 1 new breach on September 13, 2026, according to a fresh pull of the public breaches API. Combined, these listings cover 4,653,212 breached accounts worldwide.
The largest addition — Chess.com (2026) — accounts for 4,653,212 accounts in this batch. Figures are global credential-breach totals, not state-resident counts. See our live HIBP 2026 tracker for month-to-date charts.
September month-to-date now totals 4 HIBP listings covering 21,133,418 accounts indexed through September 13, 2026.
Breaches Added September 13, 2026
| Breach | Domain | Accounts | Breach Date |
|---|---|---|---|
| Chess.com (2026) | chess.com | 4,653,212 | August 3, 2026 |
HIBP indexes verified breaches after independent confirmation. A breach date reflects when the incident occurred; the added date reflects when HIBP made the listing searchable.
Multi-source context
This is the Have I Been Pwned source detail for September 13, 2026. It covers this source’s new listings only — not the multi-source week digest.
For multi-source YTD totals (not repeated here), see the breach trackers hub.
Other recent source roundups:
Independent Cybersecurity Audits
EmailMeNow domain audits on September 13, 2026 scored 1 filer domain in this batch. 1 of 1 show 15% Transport Security or below — a recurring gap that makes spoofed breach-notification email easier to deliver.
Pattern: Scores below the 100% ideal on identity or transport still leave room for spoofed incident-response email — even when website headers score higher.
| Organization | Domain | Overall | Identity | Transport | Website | Risk |
|---|---|---|---|---|---|---|
| Chess.com (2026) | chess.com | 78% | 90% | 15% | 87% | Good |
Audit links: chess.com
Related trackers
- Have I Been Pwned tracker
- All state AG trackers
- Breach monitoring guide
- Ransomware threat landscape
- Texas OAG YTD dashboard
- Washington healthcare breaches (2026)
- Washington law firm breaches (2026)
- CA September roundup
- TX September roundup
- WA September roundup
- TX Parks breach
- HIBP September roundup
- Breach data week (September)
- HHS OCR September roundup
- SEC 8-K September roundup