NSA and allies warn Zimbra users of Russian state-backed phishing campaign

The National Security Agency and partner organizations have issued an alert to organizations using the Zimbra Collaboration Suite, warning of activity attributed to a Russian state-supported threat actor and urging users to take protective steps. The advisory highlights continued risks to enterprise email and collaboration platforms and calls attention to the need for swift defensive measures by affected institutions.

Zimbra, an email and collaboration platform used by public- and private-sector organizations worldwide, has been a frequent target for cyber intrusions because of its central role in business communications. While the NSA release did not include technical details in the portion made available, the notice underscores the broader pattern of state-backed groups aiming at critical workplace tools to gain access, move laterally, and exfiltrate data.

The NSA framed the alert as part of its broader mission to provide foreign signals intelligence and to defend U.S. National Security Systems, with particular attention to organizations that support national defense and sensitive technologies. The agency also emphasized its support to U.S. military operations across all domains and its commitment to transparency and the protection of civil liberties and privacy.