CVE-2018-1000836: Apereo Bw-Calendar-Engine

Critical severity, CVSS 9.0. EPSS: 1.1% chance of exploitation in the next 30 days.

bw-calendar-engine version <= bw-calendar-engine-3.12.0 contains a XML External Entity (XXE) vulnerability in IscheduleClient XML Parser that can result in Disclosure of confidential data, denial of service, SSRF, port scanning. This attack appear to be exploitable via Man in the Middle or malicious server.

Affected products

• Apereo Bw-Calendar-Engine: up to and including 3.12.0

Published 2018-12-20. Last modified 2026-06-17.