Medium (6.1) in accellion file transfer appliance. EPSS 1.2% chance of exploitation in the next 30 days.
An issue was discovered on Accellion FTA devices before FTA_9_12_180. There is XSS in courier/1000@/index.html with the auth_params parameter. The device tries to use internal WAF filters to stop specific XSS Vulnerabilities. However, these can be bypassed by using some modifications to the payloads, e.g., URL encoding.
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
1.2% chance of exploitation in the next 30 days; higher than 68% of CVEs (scores of 2026-10-31)