CVE-2025-3928

Commvault is monitoring cyber threat activity targeting their applications hosted in their Microsoft Azure cloud environment. Threat actors may have accessed client secrets for Commvault’s (Metallic) Microsoft 365 (M365) backup software-as-a-service (SaaS) solution, hosted in Azure. This provided the threat actors with unauthorized access to Commvault’s customers’ M365 environments that have application secrets stored by Commvault. See the following resource for more information: Notice: Security Advisory (Update). CISA believes the threat activity may be part of a larger campaign targeting various SaaS companies’ cloud applications with default configurations and elevated permissions. CISA urges users and administrators to review the following mitigations and apply necessary patches and updates for all systems: Monitor Entra audit logs for unauthorized modifications or additions of credentials to service principals initiated by Commvault applications/service principals. Handle deviations from regular login schedules as suspicious. For more information, see NSA and CISA’s Identity Management guidance, as well as CISA’s guidance on Identity, Credential, and Access Management (ICAM) Reference Architecture. Review Microsoft logs (Entra audit, Entra sign-in, unified audit logs) and conduct internal threat hunting in alignment with documented organizational incident response polices. (Applies to single tenant apps only) Implement a conditional access policy that limits authentication of an application service principal to an approved IP address that is listed within Commvault’s allowlisted range of IP addresses. Note: A Microsoft Entra Workload ID Premium License is required to apply conditional access policies to an application service principal and is available to customers at an additional cost.[1] For certain Commvault customers, rotate their application secrets, rotate those credentials on Commvault Metallic applications and service principles...

Enterprise data backup platform Commvault has revealed that an unknown nation-state threat actor breached its Microsoft Azure environment by exploiting CVE-2025-3928 but emphasized there is no evidence of unauthorized data access. "This activity has affected a small number of customers we have in common with Microsoft, and we are working with those customers to provide assistance," the company

CISA has added three new vulnerabilities to its Known Exploited Vulnerabilities Catalog, based on evidence of active exploitation. CVE-2025-1976 Broadcom Brocade Fabric OS Code Injection Vulnerability CVE-2025-42599 Qualitia Active! Mail Stack-Based Buffer Overflow Vulnerability CVE-2025-3928 Commvault Web Server Unspecified Vulnerability These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the Known Exploited Vulnerabilities Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB networks against active threats. See the BOD 22-01 Fact Sheet for more information. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria.