Reisz Siderman Eisenberg Data Breach

In 2026, Reisz Siderman Eisenberg reported a data security incident involving unauthorized access to certain internal systems. According to the company’s notice, there is no indication that the data involved in this incident has been publicly disclosed or that fraud or misuse has occurred or is likely to occur. After discovering the incident, the company immediately initiated an internal investigation and engaged external cybersecurity professionals to help assess the scope and nature of the intrusion.

The investigation confirmed that personal data—potentially including names, addresses, Social Security numbers, and other identifying information—may have been accessed by an unauthorized third party. Reisz Siderman Eisenberg then began reviewing the compromised information to identify affected individuals and issued notification letters via U.S. mail as required under state and federal law.

Reisz Siderman Eisenberg is a litigation‑focused law firm headquartered in Los Angeles, with additional offices in California and Nevada. Founded in 1980, the firm handles a wide range of civil matters, including professional liability, product liability, employment‑related disputes, and general commercial litigation. Its attorneys practice in both state and federal courts, and the firm maintains a network of legal professionals across the U.S. to support cases involving clients from various industries.

Reisz Siderman Eisenberg emphasized that its operations were not disrupted as a result of the incident and that services to clients have continued without interruption. The company also included detailed guidance within its mailed notice, offering steps individuals can take to protect themselves from identity theft or fraud, including credit monitoring resources, free credit report instructions, fraud alert options, and credit freeze procedures.

The enclosed materials also advised individuals to remain vigilant by regularly monitoring credit reports, financial accounts, and any suspicious activity. Additional resources from the Federal Trade Commission, state attorney general offices, and major credit bureaus were included to assist impacted individuals in safeguarding their personal information.

If you received a Data Breach Notification Letter from Reisz Siderman Eisenberg, it confirms that your information was potentially impacted.

What information is involved in the Reisz Siderman Eisenberg Data Breach?

Compromised information may include:

Your Personally Identifiable Information (PII) may be used by cybercriminals to commit identity theft or fraud—including opening unauthorized accounts, impersonating individuals, or conducting other malicious activity.

A specific category of PII is Protected Health Information (PHI)—medical‑related data protected under federal and state privacy laws. Because Cantata provides healthcare technology services, compromised PHI may be especially valuable to cybercriminals and can be misused in combination with PII. 

Reisz Siderman Eisenberg has recommended that affected individuals take steps to protect themselves, including monitoring financial accounts, reviewing credit reports, and considering the placement of fraud alerts or credit freezes. Further instructions—along with contact information for major credit bureaus and state‑specific consumer protection rights—were provided in the notification letter and attachments.

Residents of California benefit from additional privacy protections under the California Consumer Privacy Act (CCPA), which grants enhanced rights regarding personal data. California residents may also have additional protections under state consumer-privacy regulations.

If you received a NOTICE OF DATA BREACH letter from Reisz Siderman Eisenberg, your personal information may be at risk and could be misused for identity theft or fraud.

Contact the Data Breach Attorneys at Emery | Reddy today for a Free Case Review.