When the danger comes from within: the Anthropic leak
At the end of March and beginning of April 2026, Anthropic, one of the most respected and well-funded artificial intelligence companies in the world, was involved in two security incidents in less than seven days. The first exposed internal documents about an unannounced AI model, known by the codename Mythos. The second, more serious, resulted in the leak of nearly 2,000 internal files of the Claude Code source code, the company's AI programming tool, due to human error in the packaging process via npm. Anthropic itself confirmed both incidents to The Hacker News and to The Guardian.
There was no sophisticated hacking. No coordinated hacker group. The accidental exposure of Claude's internal code happened due to a process failure, the kind that occurs in any company that deals with digital files every day.
The question that remains is simple, yet powerful: if an organization with virtually unlimited resources and dedicated security teams suffers two serious leaks in one week due tohuman error, what is protecting your company's data now?
What this episode means for your business
It is tempting to read a news story about an Anthropic leak and think:"this is a problem for big tech companies, far from my reality."But the logic of the incident tells a different story. Claude's source code was not compromised by a zero-day exploit or a ransomware attack. It was exposed publicly because an internal process was not adequately controlled.
This same scenario repeats itself in SMEs across all sectors every year. An employee attaching the wrong contract to an email. A file with customer data shared in a public folder by mistake. An access credential that was never revoked after a termination. Verizon's DBIR report consistently points out that over 68% of data breaches involve the human factor, including errors, misuse of privileges, and social engineering.
For an SME, the consequences of an accidental breach are as real as those of an attack: exposed contracts, compromised customer data, proprietary formulas or projects disclosed, and the immediate risk of legal implications under laws such as the LGPD in Brazil and the CCPA in the United States. The reputation built over years can be shaken in hours.
The Anthropic incident serves as a mirror. No matter the size or level of technological sophistication: without well-defined processes and active monitoring, vulnerability exists.
What can be done to protect your company
The good news is that there are proven and accessible technical capabilities that drastically reduce the risk of accidental exposures, and they are within reach of companies with 10 to 500 computers.
Identity management and access control with MFA. A large part of internal leaks occurs because people have access to information they shouldn't have. Implementing the principle of least privilege, combined with multi-factor authentication across all critical systems, limits the impact radius of any human error. If the employee does not have access to the file, they cannot leak the file.
Data movement monitoring (DLP). Data loss prevention solutions track how sensitive files move in and out of the organization. A well-configured DLP system can alert in real-time when a confidential file is being sent to an external email or uploaded to an unauthorized service, before damage occurs.
Segmented backup and protection of critical assets. It's not enough to have a backup: it is essential that the most sensitive data, contracts, projects, and customer records are stored in layers with independent access controls. This ensures that even in the case of an internal error, the most critical assets are isolated and recoverable.
Incident response plans that include human errors. Most incident response plans are still designed for external attacks. But as the Anthropic case shows, the roadmap must also consider internal errors: who triggers the protocol, how the exposure is contained, how those affected are notified, and how the root cause is corrected.
The question every manager should ask themselves now
If an employee at your company sent a confidential file to the wrong recipient right now, would you know how long it took?
For most SMEs, the honest answer is:only when the damage has already been done.And this is not a failure of people, it is a failure of process and visibility. With 24/7 monitoring, combined with clear data management policies and continuous team training, it is completely possible to detect suspicious activities in minutes, not days. Modern managed IT services were designed exactly to fill this gap, offering the level of control and visibility that only large corporations could maintain before.
The Anthropic incident should not generate fear, but rather action. Companies that invest in good data management practices and active monitoring are much better positioned to grow with confidence, protect their customers, and avoid unpleasant surprises. The technology for this already exists and is more accessible than ever.
References
- The Hacker News, Claude Code Leaked via npm Packaging Error
- The Guardian, Anthropic's Claude Code Leaks via AI Tool
- Verizon, Data Breach Investigations Report (DBIR)
Want to understand how your company is positioned against risks like this? Talk to the Zamak team for a Complimentary Initial Consultationin zamakt.com/contactus.