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Zimbra

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critical threat

Russian State-Backed 'LAUNDRY BEAR' Exploits Zimbra Zero-Click Vulnerability

The Russian state-supported threat group LAUNDRY BEAR is exploiting a zero-click vulnerability, dubbed 'beehive,' in the Zimbra Collaboration Suite (ZCS) webmail service, actively stealing sensitive emails and gaining persistent access to compromised networks since July 2025 by merely viewing a malicious email, with Western organizations across various sectors being targeted.

Zimbra Collaboration Suite LAUNDRY BEAR phishing zero-click espionage state-sponsored zimbra email-theft
3t
critical threat

TA488 Exploits Zimbra Mailservers with Half-Click Vulnerability CVE-2025-66376

Russia-aligned threat actor TA488 (Void Blizzard, Laundry Bear) exploited CVE-2025-66376, a critical XSS vulnerability in Zimbra Collaboration Suite webmail, for at least five months in 2025 via crafted emails to gain persistent access, exfiltrate user credentials, 2FA codes, and bulk emails from Ukrainian government and US defense industrial base targets.

PoC Zimbra Collaboration Suite +10 TA488 +2 espionage xss zimbra apt state-sponsored half-click cve-2025-66376
2r 9t 3c 7i updated
medium advisory

Zimbra Security Advisory Addresses Vulnerabilities in Zimbra Daffodil

Zimbra released a security advisory on May 28, 2026, addressing unspecified vulnerabilities in Zimbra Daffodil versions prior to v10.1.17, urging users to apply necessary updates.

Zimbra Daffodil < v10.1.17 zimbra vulnerability patch
2r
high threat

FrostyNeighbor Targets Ukraine with Updated PicassoLoader Chain

The FrostyNeighbor threat actor is targeting Ukrainian governmental organizations with spearphishing emails containing malicious PDFs that deliver a JavaScript dropper (PicassoLoader) and ultimately a Cobalt Strike beacon.

PoC Cobalt Strike +8 FrostyNeighbor cyberespionage cobaltstrike picassoloader ukraine
2r 3t 5c 16i updated
medium advisory

CVE-2026-42897 Microsoft Exchange Server Cross-Site Scripting Vulnerability

CVE-2026-42897 is a cross-site scripting (XSS) vulnerability in Microsoft Exchange Server that allows an attacker to perform spoofing attacks by injecting malicious scripts into web pages.

PoC Exchange Server +7 xss spoofing exchange
2r 2t 1c 8i updated