Threat Actor
Winter Vivern
- First Reported
- Jul 10, 2026
- Latest Reported
- Aug 25, 2026
Reported Context (2)
- The article says Russian Winter Vivern cyber spies previously exploited a reflected XSS vulnerability to steal emails from NATO-aligned accounts by targeting Zimbra webmail portals. Over 270 Zimbra Servers Reportedly Compromised via CVE-2026-73570
- Used a reflected XSS exploit to breach Zimbra webmail portals in February 2023 and steal emails. Zimbra patches critical stored XSS flaw in Classic Web Client
CVE (3)
Threat Actors (4)
MITRE ATT&CK (1)
Vendors (2)
Products (2)
Industries (1)
Countries (1)
Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.