CVE-2009-4363: Horde Application Framework

Medium severity, CVSS 4.3. EPSS: 1.4% chance of exploitation in the next 30 days.

Text_Filter/lib/Horde/Text/Filter/Xss.php in Horde Application Framework before 3.3.6, Horde Groupware before 1.2.5, and Horde Groupware Webmail Edition before 1.2.5 does not properly handle data: URIs, which allows remote attackers to conduct cross-site scripting (XSS) attacks via data:text/html values for the HREF attribute of an A element in an HTML e-mail message. NOTE: the vendor states that the issue is caused by "an XSS vulnerability in Firefox browsers."

Affected products

• Horde Application Framework: up to and including 3.3.5; version 2.0 only; version 2.1 only; version 2.1.3 only; version 2.2 only; version 2.2.1 only; …
• Horde Groupware: up to and including 1.2.4; version 1.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.0.4 only; …

Published 2009-12-21. Last modified 2026-06-16.