CVE-2020-8034: Horde Gollem

Medium severity, CVSS 6.1. EPSS: 1% chance of exploitation in the next 30 days.

Gollem before 3.0.13, as used in Horde Groupware Webmail Edition 5.2.22 and other products, is affected by a reflected Cross-Site Scripting (XSS) vulnerability via the HTTP GET dir parameter in the browser functionality, affecting breadcrumb output. An attacker can obtain access to a victim's webmail account by making them visit a malicious URL.

Affected products

• Horde Gollem: before 3.0.13 (fixed in 3.0.13)
• Horde Groupware: version 5.2.22 only

Published 2020-05-18. Last modified 2026-06-17.