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Case File: Fullsteam Software Holdings LLC d/b/a Event Rental Systems Data Breach

This file collects the dated facts on record for the Fullsteam Software Holdings LLC d/b/a Event Rental Systems incident. The state report is dated December 15, 2025. The incident itself is dated September 16, 2025.

Timeline

90 days separate the incident date from the date it was reported.

  1. September 16, 2025Incident dateWhen the filing says the breach took place.
  2. December 15, 2025Report filed in CaliforniaDate the notice was lodged with the California Attorney General.

Case facts

Filing state
California
Date reported
December 15, 2025
Incident date
September 16, 2025
Receiving office
California Attorney General

Case notes

Fullsteam Software Holdings LLC, also known as Event Rental Systems, filed a data breach notification with California regulators on December 15, 2025. This report concerns an incident that occurred on September 16, 2025, which led to the compromise of personal information. The specific type of breach remains unspecified in the public filing.

The public record does not detail the particular categories of personal information involved in this incident, nor does it specify the number of individuals affected. The filing generally refers to the exposure of personal data without further elaboration on its nature or scope.

As of the reporting date, the incident is officially under investigation. This status indicates that authorities and the company are continuing to assess the full scope and impact of the breach. This information is derived from public regulatory filings.

Individuals who believe they may be affected by this incident should remain vigilant for unusual activity. It is generally advisable to monitor account statements, review credit reports, and consider placing a fraud alert or credit freeze to help protect against potential misuse of personal information. Given the unspecified nature of the exposed data, general protective measures are recommended as a precaution.

Questions about this case file

Where does the Fullsteam Software Holdings LLC d/b/a Event Rental Systems case file come from?
Every entry is taken from the breach report Fullsteam Software Holdings LLC d/b/a Event Rental Systems lodged with the California Attorney General. Nothing here is estimated.
Why do the incident date and the report date differ?
Companies usually investigate before they report. The gap between the two dates shows how long that took.
What does the records-affected figure count?
It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.
Does this case file change over time?
Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

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Filing source: California Attorney General