US Agencies Warn of Laundry Bear Campaign Targeting Unpatched Zimbra Servers
US agencies warn Russian group Laundry Bear is exploiting a patched Zimbra flaw to steal email accounts from organizations running unpatched servers. The Cybersecurity and Infrastructure Security Agency (CISA), National Security Agency (NSA), Federal Bureau of Investigation (FBI) and other U.S. government and international partners published a joint advisory to warn that the Russia-linked APT […]
The Cybersecurity and Infrastructure Security Agency (CISA), National Security Agency (NSA), Federal Bureau of Investigation (FBI) and other U.S. government and international partners published a joint advisory to warn that the Russia-linked APT group Laundry Bear (aka Void Blizzard) is targeting organizations using unpatched Zimbra Collaboration servers.
The attackers exploit CVE-2025-66376, an XSS flaw that allows malicious JavaScript embedded in HTML emails to run automatically when viewed, enabling account theft without user interaction. The vulnerability was exploited as a zero-day before being patched and remains under active exploitation against unpatched systems.
Related breach coverage
- UK and partners expose Russian state-supported actors for new ‘zero-click’ phishing campaign targeting Western organisations2026-07-23
GCHQ’s National Cyber Security Centre and international partners issue warning as ‘LAUNDRY BEAR’ cyber threat group exposed for targeted phishing campaign
- UK and partners expose Russian state-supported actors for new ‘zero-click’ phishing campaign targeting Western organisations2026-07-23
GCHQ’s National Cyber Security Centre and international partners issue warning as ‘LAUNDRY BEAR’ cyber threat group exposed for targeted phishing campaign
- International alert spotlights Russia-linked attacks on Zimbra webmail2026-07-23
A Kremlin-backed group known as Laundry Bear has been using a zero-click phishing technique to break into Zimbra webmail accounts worldwide, the U.S. and other nations said.
- South Korea Warns of State-Backed Watering Hole Attacks2026-07-31
South Korea warned that nation-state actors are using phishing and compromised websites to silently infect citizens and businesses. South Korea agencies (The National Intelligence Service, the National Police Agency, the Korea Internet & Security Agency, and the Financial Security Institute) jointly published an advisory warning that a state-backed hacking group is actively targeting South Korean […]