CVE-2016-5303: Horde Groupware

Medium severity, CVSS 6.1. EPSS: 1.5% chance of exploitation in the next 30 days.

Cross-site scripting (XSS) vulnerability in the Horde Text Filter API in Horde Groupware and Horde Groupware Webmail Edition before 5.2.16 allows remote attackers to inject arbitrary web script or HTML via crafted data:text/html content in a form (1) action or (2) xlink attribute.

Affected products

• Horde Groupware: version 5.2.15 only

Published 2016-12-20. Last modified 2026-06-17.