FineCMS through 2017-07-11 has stored XSS in the logging functionality, as demonstrated by an XSS payload in (1) the User-Agent header of an HTTP request or (2) the username entered on the login screen.
Severity
CVSS 3.0
6.1 medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
0.6% chance of exploitation in the next 30 days; higher than 50% of CVEs (scores of 2026-10-31)