CVE-2023-26431: Open-Xchange Appsuite Backend

Medium severity, CVSS 4.3. EPSS: 0.8% chance of exploitation in the next 30 days.

IPv4-mapped IPv6 addresses did not get recognized as "local" by the code and a connection attempt is made. Attackers with access to user accounts could use this to bypass existing deny-list functionality and trigger requests to restricted network infrastructure to gain insight about topology and running services. We now respect possible IPV4-mapped IPv6 addresses when checking if contained in a deny-list. No publicly available exploits are known.

Affected products

• Open-Xchange Open-Xchange Appsuite Backend: before 7.10.6 (fixed in 7.10.6); from 8.0.0, before 8.11.0 (fixed in 8.11.0); version 7.10.6 only

Published 2023-06-20. Last modified 2026-06-17.