The U.S. Cybersecurity and Infrastructure Safety Company (CISA) on Thursday revealed that Commvault is monitoring cyber menace exercise concentrating on purposes hosted of their Microsoft Azure cloud atmosphere.
“Menace actors might have accessed shopper secrets and techniques for Commvault’s (Metallic) Microsoft 365 (M365) backup software-as-a-service (SaaS) answer, hosted in Azure,” the company stated.
“This offered the menace actors with unauthorized entry to Commvault’s clients’ M365 environments which have software secrets and techniques saved by Commvault.”
CISA additional famous that the exercise could also be a part of a broader marketing campaign concentrating 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 atmosphere.
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 permits a distant, authenticated attacker to create and execute net shells.
“Primarily based on trade specialists, this menace actor makes use of subtle strategies to attempt to achieve entry to buyer M365 environments,” Commvault stated 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 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 pointers –
- 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 software 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 greater privileges than the enterprise want
- Limit entry to Commvault administration interfaces to trusted networks and administrative programs
- 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 research the malicious exercise in collaboration with associate organizations.
