High (8.0). EPSS 69% chance of exploitation in the next 30 days.
Horde Groupware Webmail Edition through 5.2.22 allows a reflection injection attack through which an attacker can instantiate a driver class. This then leads to arbitrary deserialization of PHP objects.
Severity
CVSS 3.1
8.0 high
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
EPSS
69% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)