HackingTechnologyInformationVulnerability ExploitCapture Stored DataData ExfiltratedCustomer Data InvolvedIdentity (basic)Financial accountFinancial credentialsLowContained

Fullsteam Software Holdings LLC

bd_ab38ef80dbdd4511 · schema v1 · pii pii-v1

Severity

Low

Discovered

—

Filed

Dec 15, 2025

To disclose

—

Affected

Not disclosed

Linked

3 filings

Confidence

65%

Full breach record for Fullsteam Software Holdings LLC →

Event Rental Systems (ERS) disclosed that unauthorized code was inserted into customer website modules to scrape payment card data (card numbers, CVV, expiration dates) and contact information between October 2024 and October 2025. The company removed the code, engaged forensic investigators, notified law enforcement and card brands, and is offering one year of credit monitoring and identity restoration services via Experian to affected individuals.

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Incident timeline

Oct 1, 2024

Begins

Dec 15, 2025

Filed

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Massachusetts State AGbd_a418f0132ce916992025-12-15Verified
Texas State AGbd_717dfdd0ee8232f42025-12-16 · +1dVerified

Name: Fullsteam Software Holdings LLC
norm: fullsteam software

Name: Fullsteam Software Holdings LLC
norm: fullsteam software
Also named: Fullsteam Software Holdings LLCdba oflegal entity
Event Rental Systemsdba oftrade name
Industry: Technologyllm

Discovered: —
Breach occurred: Oct 1, 2024 – Oct 31, 2025
Materiality determined: —
Notification sent: Dec 15, 2025
Affected individuals: Not disclosed
Data types: Identity (basic)Financial accountFinancial credentials
Attack vector: Unknown
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Notified law enforcement
Initial access: exploit_public_facing

During the incident: Removed the unauthorized code
Took steps to secure the affected systems
Engaged a forensic firm to investigate how the unauthorized code functioned and what data was affected
Notified law enforcement and the card brands
Offering one year of complimentary credit monitoring and identity restoration services through Experian
Changes made: Deployed additional safeguards onto our systems
Reinforcing our security practices
Actively reviewing our systems to enhance security monitoring and controls
Regularly review our security and privacy policies and procedures and implement changes when needed
Source: Quoted from the filing itself, not independently verified.

Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Massachusetts State AGDec 15 · first

California State AGDec 15 · first · this page

Texas State AG+1d

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://oag.ca.gov/ecrime/databreach/reports/sb24-615769
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 15, 2025
Raw hash: e5e2d37f3ab794e402ff6c40d7dac91d66e6c6ec908a21f69b964726f4ae1265

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityFullsteam Software Holdings LLC

Victim entityFullsteam Software Holdings LLC

IncidentUnknown

Stated responseRemoved the unauthorized code

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov