CVE-2021-35300: Zammad

Medium severity, CVSS 4.3. EPSS: 0.9% chance of exploitation in the next 30 days.

Text injection/Content Spoofing in 404 page in Zammad 1.0.x up to 4.0.0 could allow remote attackers to manipulate users into visiting the attackers' page.

Affected products

• Zammad Zammad: from 1.0.0, up to and including 4.0.0

Published 2021-06-28. Last modified 2026-06-17.