CVE-2020-8986: Zend Zendto

Critical severity, CVSS 9.8. EPSS: 1.5% chance of exploitation in the next 30 days.

lib/NSSDropbox.php in ZendTo prior to 5.22-2 Beta failed to properly check for equality when validating the session cookie, allowing an attacker to gain administrative access with a large number of requests.

Affected products

• Zend Zendto: version 3.10 only; version 3.11 only; version 3.12 only; version 3.13 only; version 3.20 only; version 3.51 only; …

Published 2020-03-24. Last modified 2026-06-17.