The U.S. Cybersecurity and Infrastructure Safety Company (CISA) on Thursday revealed that Commvault is monitoring cyber menace exercise focusing on purposes hosted of their Microsoft Azure cloud surroundings.
“Menace actors might have accessed consumer secrets and techniques for Commvault’s (Metallic) Microsoft 365 (M365) backup software-as-a-service (SaaS) resolution, hosted in Azure,” the company stated.
“This offered the menace actors with unauthorized entry to Commvault’s prospects’ 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 focusing on varied 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 surroundings.
The incident led to the invention 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 internet shells.
“Primarily based on business consultants, this menace actor makes use of refined methods to attempt to acquire entry to buyer M365 environments,” Commvault stated in an announcement. “This menace actor might have accessed a subset of app credentials that sure Commvault prospects use to authenticate their M365 environments.”
Commvault stated 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 beneath tips –
- Monitor Entra audit logs for unauthorized modifications or additions of credentials to service principals initiated by Commvault purposes/service principals
- Evaluate Microsoft logs (Entra audit, Entra sign-in, unified audit logs) and conduct inner menace looking
- For single tenant apps, implement a conditional entry coverage that limits authentication of an utility service principal to an authorized IP deal with that’s listed inside Commvault’s allowlisted vary of IP addresses
- Evaluate the record of Software Registrations and Service Principals in Entra with administrative consent for increased privileges than the enterprise want
- Limit entry to Commvault administration interfaces to trusted networks and administrative techniques
- Detect and block path-traversal makes an attempt and suspicious file uploads by deploying a Net Software Firewall and eradicating exterior entry to Commvault purposes
CISA, which added CVE-2025-3928 to its Identified Exploited Vulnerabilities Catalog in late April 2025, stated it is persevering with to analyze the malicious exercise in collaboration with companion organizations.
