Siemens Data Breach History

This page tracks the Siemens data breach history and cybersecurity incidents affecting Siemens (Germany). BreachHistory currently indexes 4 publicly disclosed or catalogued incidents spanning 2010 through 2023, with approximately 205 thousand 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 Siemens 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 Siemens Data Breaches

The largest indexed incidents include the 2010 — Siemens: Location of breached information: Theft Business…, the 2012 — Siemens: Location of breached information: Theft Business…, and the 2013 — Siemens: A computer data entry error resulted in a mailing…. Record counts originating from threat actors or leak sites should be treated as estimates unless confirmed by Siemens or a regulator. Below is the list of large data breaches:

• 2010 2010 — Siemens: Location of breached information: Theft Business… — about 130.5K records exposed · Catalogued incident
• 2012 2012 — Siemens: Location of breached information: Theft Business… — about 66.6K records exposed · Catalogued incident
• 2013 2013 — Siemens: A computer data entry error resulted in a mailing… — about 8.3K records exposed · Catalogued incident

What Information Was Exposed?

Depending on the incident, exposed data may include payment card and financial account data, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.

Siemens Data Breach 2026

At the time of this update, no Siemens data breach has been catalogued for 2026. 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 Siemens 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 Siemens 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.