Dropbox Data Breach History

This page tracks the Dropbox data breach history and cybersecurity incidents affecting Dropbox (United States). BreachHistory currently indexes 8 publicly disclosed or catalogued incidents spanning 2011 through 2026, with approximately 206.0 million records reported as exposed across all indexed events. These totals may include overlapping datasets or third-party estimates and should not be interpreted as unique affected users.

The Dropbox breach timeline includes major data breaches, cyber attacks, data leaks, credential exposures, API abuse, and other security incidents. Each incident provides details on the estimated records exposed, attack method, affected data types, and supporting public sources. Currently, 0 incidents are company-confirmed.

Largest Dropbox Data Breaches

The largest indexed incidents include the 2016 — Dropbox: User credentials were stolen in a 2012 hack, but…, the 2012 — Dropbox: Hacking, 68,648,009 records, and the 2012 Credential breach — 68.6M accounts, along with additional historical incidents involving exposed passwords, public databases, and large-scale data scraping. Record counts originating from threat actors or leak sites should be treated as estimates unless confirmed by Dropbox or a regulator. Below is the list of large data breaches:

• 2016 2016 — Dropbox: User credentials were stolen in a 2012 hack, but… — about 68.7M records exposed · Catalogued incident
• 2012 2012 — Dropbox: Hacking, 68,648,009 records — about 68.6M records exposed · Catalogued incident
• 2012 2012 Credential breach — 68.6M accounts — about 68.6M records exposed · Catalogued incident
• 2012 2012 — Dropbox: Hacked, 30K records — about 30.0K records exposed · Catalogued incident
• 2026 2026 Dropbox — ~5,000 accounts via Lenovo ID email-verification flaw (Aug 4–21 SSO bypass) — about 5.0K records exposed · Catalogued incident

What Information Was Exposed?

Depending on the incident, exposed data may include email addresses, passwords and login credentials, phone numbers, names, physical addresses, health and medical (PHI) records, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.

Dropbox Data Breach 2026

At the time of this update, BreachHistory catalogues 1 2026 incident related to Dropbox. Most recent entry: 2026 Dropbox — ~5,000 accounts via Lenovo ID email-verification flaw (Aug 4–21 SSO bypass). New incidents are added as official disclosures, regulatory filings, or credible cybersecurity reports become available.

What To Do If You Were Affected

If you believe your account may have been involved in a Dropbox data breach, change any reused passwords, enable multi-factor authentication (MFA), monitor your account for suspicious activity, and be cautious of phishing emails or fake breach notifications.

This Dropbox breach history is maintained by BreachHistory using public disclosures, regulatory filings, security research, and clearly labelled third-party claims. For the complete breach timeline, records exposed, incident details, and AI Breach Risk Score, explore the sections on this page.