Most Business Cloud Storage Breaches Trace Back to Preventable Mistakes

Cloud Storage Has Become a Prime Target for Business Data Theft

Cloud storage has made file access and collaboration easier for nearly every organization. Contracts, HR records, customer data, and financial reports now sit in shared drives and storage buckets that teams can reach from anywhere. That convenience has also made cloud storage one of the most common places for business data to leak.

According to a recent analysis from cloud security firm Wiz, misconfigurations are the common thread across most cloud breaches, and they’re also the most preventable. In December 2025 alone, a single publicly accessible storage container at one HR technology platform exposed roughly 26 million resumes. Under the shared responsibility model, the cloud provider secures its infrastructure, but your organization owns the security of its data, configurations, and access policies.

Where Business Cloud Storage Breaks Down

At PC Matic, we believe effective security starts with a clear view of the gaps. For most organizations, cloud storage risk comes down to four areas.

Misconfigured storage

A single bucket or container left open to the public can expose everything inside it. Wiz research found that 72% of cloud environments have publicly exposed platform databases without sufficient access controls.

Over-permissive access

Sharing links and access tokens often grant far more than intended. In 2023, Microsoft AI researchers accidentally exposed 38TB of internal data through one access token scoped to an entire storage account instead of a few files.

Stolen credentials

In a 2024 campaign, attackers accessed roughly 165 customer environments at a major cloud data platform using usernames and passwords harvested by infostealer malware. None of the targeted accounts required multi-factor authentication (MFA).

Shadow IT

Employees connect unapproved apps to company accounts to work faster. In April 2026, a breach at cloud platform Vercel traced back to an employee granting an unsanctioned AI tool “Allow All” access to their corporate Google Workspace.

Each additional copy of a sensitive file stored in the cloud increases these risks. The more places data lives, the more access settings you can get wrong.

Three Steps to Reduce Your Cloud Storage Exposure

1. Audit storage permissions and sharing links.
   1. Inventory where sensitive data lives across every cloud account. 
   2. Remove public access that isn’t required.
   3. Replace “anyone with the link” sharing with named users.
   4. Set expiration dates on external links.
   5. Apply least-privilege access so each user and service account can reach only what it needs.
2. Lock down identities.
   1. Require MFA on every account with access to company data.
   2. Remove dormant or former-employee accounts.
   3. Review which third-party apps have access to your cloud environment and revoke anything unapproved or overly broad.
3. Move sensitive file exchange to direct file sharing.
   1. Direct peer-to-peer file sharing is ideal for contracts, financial records, sensitive documents, and proprietary information.
   2. P2P utilizes an encrypted connection and eliminates a stored copy on a third-party server. 

Stop the Malware That Steals Cloud Credentials

Many cloud storage breaches start on an employee’s endpoint, where infostealer malware quietly collects saved passwords and session tokens that attackers later use to sign in as a legitimate user.

PC Matic Pro stops that chain. Its application allowlisting uses a default-deny approach: only approved programs are allowed to run, and everything else is blocked. If an infostealer or other unknown executable lands on a device, it can’t run, and the credentials protecting your cloud data stay out of attackers’ hands.

Fewer Copies, Fewer Openings

Cloud storage will remain essential for many organizations, but it works best when it holds only what it needs to. By tightening permissions, securing identities, and sharing your most sensitive files directly, you shrink the attack surface attackers depend on.