high severity June 11, 2023 · 4 min read Unverified claim — what this is

Comisión Nacional de Valores Listed by medusa Ransomware Group

If you are a customer of Comisión Nacional de Valores, here’s what is being claimed, and what it would mean for you.

Regulatory agency in charge of authorizing IPOs and securing compliance by market participants with federal securities laws in the Argentine Republic. It supervises brokerage firms, issuers, stock exchanges, mutual funds and credit rating agencies. It is a member of IOSCO. More than 1.5TB of documents & database dumps has been uploaded.
— from Medusa’s own leak-site posting. This is the group’s claim, quoted verbatim; it is not GalaxyWarden’s reporting and has not been independently verified.

Comisión Nacional de Valores Listed by medusa Ransomware Group

On June 11, 2023, the Comisión Nacional de Valores, Argentina’s national securities regulator, appeared on the leak site of the Medusa ransomware group. The listing states that the agency suffered a ransomware attack in which internal files were exfiltrated; more than 1.5 TB of documents and database dumps have already been published on the extortion portal.

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Reported Details from the Listing

The Medusa leak site entry, still accessible via the .onion link, identifies the Comisión Nacional de Valores as a victim and confirms that attackers extracted internal files during a ransomware incident. The disclosure does not specify the exact number of individuals whose records were taken, nor does it list every data type exposed. It does state that the stolen material includes both documents and database dumps totaling more than 1.5 TB. No ransom demand figure is published on the page, and the listing does not indicate whether the agency paid or refused to pay.

Why This Matters for You and Your Family

When a national securities regulator is breached, the consequences reach far beyond corporate boardrooms. Investors, brokerage customers, mutual-fund holders, and anyone whose identity or financial activity appears in CNV-supervised records may now face heightened risk. If your broker, issuer, or credit-rating file was among the exfiltrated material, your name, tax identifiers, contact details, or transaction history could be sitting in an attacker-controlled archive. That information sells quickly on underground markets and can be used to file fraudulent tax returns, open accounts in your name, or pressure you with targeted phishing. Even if you never directly interacted with the CNV, shared service providers or counterparties may have routed your data through systems now confirmed compromised.

The Doxxing and Identity-Chain Risk

Leaked regulatory documents frequently contain more than dry compliance forms. They often link personal identifiers to email addresses, phone numbers, employer details, and sometimes family-member information. Attackers chain these fragments with data from previous breaches to build complete identity profiles. A single exposed email can unlock linked gaming accounts, social-media handles, or cloud storage belonging to you or your children. Credential leaks of this nature routinely cascade into account takeovers that expose private messages, location history, and photographs. Continuous monitoring across 13.1B+ breach records and 100+ platforms is therefore essential, because the first time you learn of the exposure is rarely the last time the data is reused.

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Report details & sourcing

Attributed to Medusa · 515 incidents tracked →

Severity High the filing does not enumerate what was exposed

Disclosed June 11, 2023

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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Medusa — 515 incidents tracked

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