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Cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*

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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.

Zimbra Collaboration Suite +2 TA488 +2 espionage xss zimbra apt state-sponsored half-click cve-2025-66376
2r 9t 1c
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