Russian LAUNDRY BEAR Hackers Exploit Zimbra Zero

Gbhackers •Divya • July 24, 2026

Russian state-supported threat actors, known as LAUNDRY BEAR, have exploited a zero-day vulnerability in the Zimbra Collaboration Suite to steal up to 909,090 days’ worth of emails from targeted organizations across Western countries. A joint cybersecurity advisory, AA26-204A, issued on July 23, 2026, warns that this espionage-focused group has targeted government, defense, energy, technology, education, […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Russian Hackers Exploit Zimbra Zero-Day for Espionage Campaign Since July 2025, Russian state-backed hackers, known as Laundry Bear, have exploited a zero-click vulnerability (CVE-2025-66376) in the Zimbra Collaboration Suite to infiltrate Western government and commercial organizations. This attack method allows hackers to steal sensitive data without requiring victims to click links or open attachments, merely by opening or previewing an email. The campaign has targeted over ten organizations, including those in the defense, energy, and technology sectors, with a focus on NATO countries and Ukraine. The vulnerability was patched in November 2025, but many systems remain unpatched. Cybersecurity agencies from the US and allied nations have issued urgent advisories to mitigate the threat. The attacks have been linked to espionage activities aimed at gathering intelligence for the Russian government. 47 sources 81

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Russian LAUNDRY BEAR Hackers Exploit Zimbra Zero

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