The U.S. Cybersecurity and Infrastructure Safety Company (CISA) on Thursday revealed that Commvault is monitoring cyber menace exercise concentrating on functions hosted of their Microsoft Azure cloud setting.
“Menace actors might have accessed consumer secrets and techniques for Commvault’s (Metallic) Microsoft 365 (M365) backup software-as-a-service (SaaS) answer, hosted in Azure,” the company mentioned.
“This supplied the menace actors with unauthorized entry to Commvault’s clients’ M365 environments which have utility secrets and techniques saved by Commvault.”
CISA additional famous that the exercise could also be a part of a broader marketing campaign concentrating on numerous software-as-a-service (SaaS) suppliers’ cloud infrastructures with default configurations and elevated permissions.
The advisory comes weeks after Commvault revealed that Microsoft notified the corporate in February 2025 of unauthorized exercise by a nation-state menace actor inside its Azure setting.
The incident led to the discovery that the menace actors had been exploiting a zero-day vulnerability (CVE-2025-3928), an unspecified flaw within the Commvault Net Server that allows a distant, authenticated attacker to create and execute net shells.
“Primarily based on business consultants, this menace actor makes use of refined methods to attempt to achieve entry to buyer M365 environments,” Commvault mentioned in an announcement. “This menace actor might have accessed a subset of app credentials that sure Commvault clients use to authenticate their M365 environments.”
Commvault mentioned it has taken a number of remedial actions, together with rotating app credentials for M365, however emphasised that there was no unauthorized entry to buyer backup information.
To mitigate such threats, CISA is recommending that customers and directors comply with the under tips –
- Monitor Entra audit logs for unauthorized modifications or additions of credentials to service principals initiated by Commvault functions/service principals
- Assessment Microsoft logs (Entra audit, Entra sign-in, unified audit logs) and conduct inner menace searching
- For single tenant apps, implement a conditional entry coverage that limits authentication of an utility service principal to an permitted IP deal with that’s listed inside Commvault’s allowlisted vary of IP addresses
- Assessment the record of Utility Registrations and Service Principals in Entra with administrative consent for larger privileges than the enterprise want
- Prohibit entry to Commvault administration interfaces to trusted networks and administrative methods
- Detect and block path-traversal makes an attempt and suspicious file uploads by deploying a Net Utility Firewall and eradicating exterior entry to Commvault functions
CISA, which added CVE-2025-3928 to its Recognized Exploited Vulnerabilities Catalog in late April 2025, mentioned it is persevering with to research the malicious exercise in collaboration with accomplice organizations.
