Cloud file-sharing sites targeted for corporate data theft attacks

BleepingComputer

January 5, 2026 at 10:52 PM

Actively Exploited

Overview

A threat actor named Zestix has reportedly stolen corporate data from numerous companies after breaching their cloud file-sharing services, specifically ShareFile, Nextcloud, and OwnCloud. This attack highlights the vulnerabilities present in these platforms, which are widely used for storing and sharing sensitive business information. Companies that rely on these services should be particularly vigilant, as the stolen data is being offered for sale on dark web forums. The incident raises concerns about the security measures in place for protecting corporate data in cloud environments. Organizations are urged to review their security protocols and consider additional protections to safeguard against similar attacks.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: ShareFile, Nextcloud, OwnCloud
Action Required: Companies should review and enhance their security measures for cloud file-sharing services, implement stronger access controls, and consider data encryption.
Timeline: Newly disclosed

Original Article Summary

A threat actor known as Zestix has been offering to corporate data stolen from dozens of companies likely after breaching their ShareFile, Nextcloud, and OwnCloud instances. [...]

Impact

ShareFile, Nextcloud, OwnCloud

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Companies should review and enhance their security measures for cloud file-sharing services, implement stronger access controls, and consider data encryption.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Read Original Article

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