CVE-2025-52557: Mail-0 Zero

High severity, CVSS 8.6. EPSS: 0.4% chance of exploitation in the next 30 days.

Mail-0's Zero is an open-source email solution. In version 0.8 it's possible for an attacker to craft an email that executes javascript leading to session hijacking due to improper sanitization. This issue has been patched in version 0.81.

Affected products

• Mail-0 Zero: version 0.8 only

Published 2025-06-21. Last modified 2026-06-17.