CVE-2023-50455: Zammad

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

An issue was discovered in Zammad before 6.2.0. Due to lack of rate limiting in the "email address verification" feature, an attacker could send many requests for a known address to cause Denial Of Service (generation of many emails, which would also spam the victim).

Affected products

• Zammad Zammad: version 6.1.0 only; version 6.2.0 only

Published 2023-12-10. Last modified 2026-06-17.