Post #4059302

Proofpoint uncovered that Russia-aligned threat actor TA488 (Void Blizzard, Laundry Bear) was exploiting a previously unknown vulnerability against Zimbra mailservers for at least five months during 2025, until the issue was patched with CVE-2025-66376. https://www.proofpoint.com/us/blog/threat-insight/ta488-targets-zimbra-mailservers-half-click-exploits