high severity October 05, 2025 · 3 min read Unverified claim — what this is

California Golf Club of San Francisco Listed by Qilin Ransomware Group

If you are a customer of California Golf Club of San Francisco, here’s what is being claimed, and what it would mean for you.

California Golf Club of San Francisco was listed on Qilin's leak site. Qilin claims to have stolen internal data. This is the group's claim, not a confirmed finding.

California Golf Club of San Francisco Listed by Qilin Ransomware Group

On October 5, 2025, the California Golf Club of San Francisco appeared on the leak site of the qilin ransomware group in a listing claiming internal files were exfiltrated during a ransomware attack.

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What Public Reporting Shows

Public reporting indicates that the club, commonly known as Cal Club, had data taken by the attackers. The club was established in 1918 and occupies a 425-acre property in San Francisco. Available reporting describes the incident as a ransomware attack in which internal files were allegedly exfiltrated. The exact number of members or individuals whose information may have been exposed remains unknown. No specific types of personal data such as member names, addresses, or payment details have been detailed in initial public reporting.

Why This Matters for You and Your Family

When a private club like Cal Club suffers a breach, member information can easily end up in the hands of criminals. If you or your family belong to similar organizations, your contact details, payment records, or other personal data may have been taken. This kind of exposure puts everyday families at risk of identity theft, unwanted solicitations, and more targeted scams. Even if the club has not yet confirmed what was allegedly stolen, the simple fact that internal files were taken means you should treat your information as potentially compromised.

The Doxxing and Identity-Chain Implications

Ransomware leaks rarely stop at one dataset. Criminals often combine newly exposed club records with information from earlier breaches to build detailed profiles. A leaked email or phone number from the golf club can be linked to your social media accounts, children’s online profiles, or shared family addresses. These identity chains make it easier for attackers to impersonate you, hijack accounts, or launch doxxing campaigns. Credential leaks like this one frequently cascade into gaming account takeovers, especially when family members reuse passwords across club portals, email, and children’s gaming platforms.

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What the free scan actually returns

Sample resultyou@email.comIllustrative — not a real person

Found on people-search siteswe remove these

These listings are live, public, and legal to remove — and removing them is what we do.

value redacted in this sampleage, relatives, address historySpokeo

value redacted in this samplephone, household, property recordsBeenVerified

value redacted in this sample580 companies checked

Found in breach recordsverifiedreported — unverified

Each record is labeled: confirmed breach data, or an attacker’s claim no one has verified.

verifiedvalue redacted in this samplepassword + phone · 2024telecom breach

unverifiedvalue redacted in this sampleclaimed in ransomware listing · 2026leak-site claim

Leaked data cannot be deleted from the internet — anyone claiming otherwise is lying. Broker listings can be removed. We do the second, and show you exactly what to fix from the first.

Report details & sourcing

Attributed to Qilin · 2348 incidents tracked →

Severity High the filing does not enumerate what was exposed

Disclosed October 05, 2025

Last reviewed August 8, 2026

Affected Unconfirmed

By GalaxyWarden Threat Research · Editorial & sourcing standards

Unverified claim — what this report is

This page documents a public listing on a ransomware/extortion group’s leak site, tracked via public threat-intelligence sources. A listing is the attacker’s claim. GalaxyWarden aggregates and reports such claims; we have not independently verified that a breach occurred, what data (if any) was taken, or the accuracy of anything the group asserts, and the named organisation has not necessarily confirmed the incident. Sections above describe what the listing shows and the group’s documented history — not verified findings about the named organisation. If you represent this organisation and believe anything here is inaccurate, tell us and we’ll review it promptly.

Editorial & sourcing policy

GalaxyWarden is a breach-monitoring service and news aggregator. We do not exfiltrate, host, purchase, or redistribute stolen data. Breach information is compiled from publicly accessible sources and threat-intelligence platforms, and is reported as claims attributed to their source. We promptly correct or remove material shown to be inaccurate — see our content & takedown policy or write to support@galaxywarden.com.

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Qilin — 2348 incidents tracked

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