Exponent CMS 2.3.9 suffers from a remote code execution vulnerability in /install/index.php. An attacker can upload an evil 'exploit.tar.gz' file to the website, then extract it by visiting '/install/index.php?install_sample=../../files/exploit', which leads to arbitrary code execution.
Severity
CVSS 3.0
9.8 critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
3.9% chance of exploitation in the next 30 days; higher than 90% of CVEs (scores of 2026-10-31)