Breach404
Back to Insights
Secure Software2 min readJuly 23, 2026

Russian Hackers Exploit Zimbra Zero-Day Against US, Ukraine Targets

Russian state-sponsored hackers are exploiting a previously unknown vulnerability in Zimbra email systems to target organizations in the US and Ukraine, requiring victims to only open or preview a malicious email message for compromise. Organizations usin

Could your website be vulnerable to attacks like this?

Run a free 10-point security scan on your site - headers, SSL, DNS, and more. Results in 15 seconds.

Test Your Site Now - It's Free