CVE-2016-6854: Open-Xchange Ox Guard

Medium severity, CVSS 6.1. EPSS: 2.4% chance of exploitation in the next 30 days.

An issue was discovered in Open-Xchange OX Guard before 2.4.2-rev5. Script code which got injected to a mail with inline PGP signature gets executed when verifying the signature. Malicious script code can be executed within a user's context. This can lead to session hijacking or triggering unwanted actions via the web interface (sending mail, deleting data etc.).

Affected products

• Open-Xchange Ox Guard: up to and including 2.4.2

Published 2016-12-15. Last modified 2026-06-17.